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Converting a Subaru automatic transmission such as the 4EAT or 5EAT to a two-wheel drive (2WD) layout is one of the most popular steps in Volkswagen-running Subaru drivetrain builds. It allows you to shed AWD weight, simplify drivetrains, and tailor performance for mid-engine or rear-engine setups.

However, these conversions are intricate, and even small oversights can cause catastrophic failures or expensive rebuilds. As a Volkswagen-running Subaru drivetrain auto parts manufacturer, we’ve seen what goes wrong most often. Below are the five biggest mistakes to avoid so your 2WD automatic build runs reliably for years.

1. Choosing The Wrong Kit For Your Rotation Needs

What Goes Wrong

Many builders don’t confirm the rotation direction their build requires. Subaru automatics were designed for AWD setups, so when they are converted to 2WD, rotation must match your axle layout.

Why It Matters

• Using the wrong rotation direction causes the wheels to spin backward in mid-engine layouts.

• Incorrect rotation can damage differentials or create unusable gearing ratios.

• Fixing this error later requires a complete teardown.

How To Avoid It

• Understand your build’s layout (front-engine vs. mid-engine).

• The 5EAT 2WD and standard 4EAT 2WD conversion kits maintain original Subaru rotation.

• If your mid-engine setup requires the opposite rotation, use the 4EAT 2WD Reversed Rotation Kit specifically made for that purpose.

Pro tip: Decide on your layout first, then select the right conversion kit. This eliminates trial and error and prevents costly mismatches.

2. Leaving The Rear Output Unsupported Or Unsealed

What Goes Wrong

Some builders simply remove the AWD center differential parts and leave the rear output shaft area open, unsupported, or poorly blocked off.

Why It Matters

• Open housings allow dirt, dust, and moisture to enter the case.

• Unsupported shafts or bearings can float and wear out prematurely.

• Leaks from unsealed housings cause fluid loss, overheating, and failure.

How To Avoid It

• Use a conversion kit that properly eliminates the AWD output section.

• Confirm that the rear section is sealed and the bearings are supported after assembly.

• Only use quality gaskets and sealants recommended for ATF-exposed surfaces.

Important Distinction:

If you are converting a manual 5-speed to 2WD, use a Subaru transmission cap for the extension housing to seal the back of the nose cone. This part is not for automatics but is essential in manual conversions.

3. Skipping Oil Pressure Checks On The Engine Side

What Goes Wrong

Builders often focus entirely on the transmission but ignore the engine’s oil pressure system during conversion. This is risky, especially with Subaru EJ253 engines, which are commonly paired to automatic transmissions in conversions.

Why It Matters

• EJ253 engines are known to develop cracks at the oil pressure sensor port on the cylinder head.

• This causes inaccurate pressure readings or oil leaks that can harm the engine.

• Bad oil pressure data can confuse your ECU, affect shifting logic, and ruin an otherwise sound build.

How To Avoid It

• Before final installation, confirm actual oil pressure on the engine.

• Repair any oil sender port damage using a dedicated Oil Pressure Sensor/Sender Repair Kit for Subaru EJ253 engines.

• Only proceed with transmission installation once correct oil pressure is confirmed.

Pro tip: Fixing this early prevents having to pull the entire drivetrain back out just to patch a leak or sensor error.

4. Overloading Stock Internal Parts Without Reinforcement

What Goes Wrong

Many people assume the stock 4EAT or 5EAT internals will survive new loads, aggressive driving, or performance upgrades. That’s rarely true.

Why It Matters

• Transmission internals are tuned for factory torque and load.

• Mid-engine swaps often create new stress angles and higher shock loads.

• Stock gearsets, bearings, and torque converters may overheat or fail.

How To Avoid It

• Inspect and refresh wear items like clutches, seals, and bearings before conversion.

• Consider upgrading gearsets or torque converters if adding power.

• Make sure mounts, brackets, and cooling systems can handle the load.

Pro tip: Our conversion kits are designed for heavy-duty use in performance and off-road builds, with carefully matched internals to withstand higher torque.

5. Neglecting Fluid Specs, Cooling, And Maintenance

What Goes Wrong

Fluid management is often an afterthought. Using the wrong ATF, skipping filter replacements, or ignoring heat control can quickly destroy a converted automatic.

Why It Matters

• Automatic transmissions rely on clean, correct-spec ATF for pressure and lubrication.

• Heat kills seals, solenoids, and clutch packs faster than anything else.

• Relocated or custom setups can restrict cooling airflow, accelerating wear.

• Some builders also add custom oil pans without realizing how oil slosh affects pickup.

How To Avoid It

• Always use Subaru-spec ATF and change it regularly.

• Install or upgrade external transmission coolers if airflow is reduced.

• Keep filters clean and watch for debris on the magnets.

• If using a pan without baffles, avoid prolonged high-g corners until you verify stable pressure.

Pro tip: Combining proper cooling with clean ATF is the easiest way to double the lifespan of a converted automatic transmission.

About Us

Specialised Parts is a Volkswagen-running Subaru drivetrain auto parts manufacturer and supplier. We produce precision-engineered components such as Subaru automatic transmission 4EAT and 5EAT 2WD conversion kits, 4EAT reversed rotation kits, EJ253 oil pressure sensor/sender repair kits, reversed ring & pinion gearsets, and short shifter assemblies.

Our products are manufactured for Subaru parts but are compatible with many vehicles that use Subaru components, especially VW builds. Compatibility varies by model, and our team is here to help you select the correct parts.

Contact us today to get the right components for your Subaru-to-VW drivetrain conversion and build your 2WD setup for reliability and long-term performance.

In the world of drivetrain conversions, reversed ring and pinion gear sets play a critical role in making unconventional builds run smoothly. These specialized gear sets allow builders to adapt Subaru transmissions for unique applications, including mid-engine layouts and custom Volkswagen-running Subaru drivetrain setups.

Understanding how these gears are manufactured and what separates a reliable set from a weak one is essential for anyone planning a conversion project.

This blog examines the manufacturing process of reversed ring and pinion gears, the factors that determine their quality, and how they integrate into VW-Subaru drivetrain conversions. If you are looking for dependable reverse ring and pinion gear sets designed specifically for Subaru transmissions, this guide will help you make an informed choice.

The Precision Manufacturing Process Behind Reversed Gear Sets

Producing reversed ring and pinion gear sets requires advanced engineering and strict quality control. These are high-stress components that endure constant torque and rotational load, so they cannot be made with general-purpose machining. Below are the core steps involved in their manufacturing.

1. Metallurgical Selection And Forging

High-strength alloy steel is chosen for both the ring and the pinion. These alloys are selected for their toughness, wear resistance, and ability to withstand continuous torque. The gear blanks are typically forged to increase grain density and eliminate structural weaknesses that could lead to gear tooth failure under load.

2. Precision Gear Cutting

Once forged, the blanks undergo gear cutting using specialized CNC gear hobbing or gear shaping machines. These machines cut the helical or hypoid teeth to exact specifications. The gear profiles are carefully designed to ensure smooth engagement and minimal backlash, which directly affects drivetrain noise and wear.

3. Heat Treatment For Durability

After cutting, the gear sets are heat-treated through processes like carburizing or induction hardening. This creates a hardened outer case with a tough, ductile core. Heat treatment improves tooth wear resistance while maintaining enough core flexibility to absorb sudden torque spikes without fracturing.

4. Grinding And Lapping For Smooth Operation

Post-heat-treatment grinding ensures that each tooth’s surface is smooth, uniform, and precisely dimensioned. The gears are then lapped together in matched pairs to ensure perfect meshing. This step significantly reduces noise and friction, enabling the gear set to operate quietly and last longer in high-performance builds.

5. Rigorous Quality Inspection

Finally, each gear set is inspected for tooth accuracy, runout, and hardness. Any imperfection in alignment or hardness can lead to early failure. Precision is especially important for reversed gear sets used in conversions because any misalignment can cause excessive wear when the transmission is mounted in a non-standard orientation.

What Defines A High-Quality Reversed Ring & Pinion Gear Set

Knowing how these gears are made helps builders understand what separates a premium set from an unreliable one. Here are the qualities that define a good reversed ring and pinion gear set:

Accurate Gear Geometry

High-quality sets feature precision-cut teeth that mesh perfectly under load. Accurate tooth geometry ensures quiet operation, smooth power transfer, and minimal wear on bearings and differentials.

Superior Heat Treatment

Consistent heat treatment gives gear teeth the hardness to resist wear without making them brittle. This balance is crucial because brittle gears can crack under shock loads common in off-road or performance use.

Perfect Tooth Contact Pattern

Matched ring and pinion sets should display full tooth contact during pattern checks. This shows that the gears have been lapped together and will distribute torque evenly across the gear face.

Strong Core Material

Premium sets are made from forged alloy steel with high tensile strength and fatigue resistance. This helps the gears handle sustained torque without developing microscopic cracks that can propagate over time.

Designed For Specific Applications

Reversed ring and pinion gear sets should be engineered for specific transmissions, not adapted from unrelated systems. Purpose-built gears reduce the risk of misalignment, noise, or premature wear in conversion setups.

Reversed Ring & Pinion Gear Sets From Specialised Parts

Specialised Parts manufactures precision-engineered reversed ring and pinion gear sets specifically for Subaru 5-speed manual transmissions, ideal for builders converting Subaru drivetrains into custom Volkswagen chassis.

• Both 2WD and AWD sets reverse the rotation direction of the output axles.

• Available gear ratios include 3.90, 4.11, 4.44, and 4.86.

• The 2WD kit also includes a spline adapter to convert AWD to 2WD.

• The AWD version retains AWD function and is sold as gears only, with a typical lead time of 10 to 14 weeks.

Each set is crafted with close attention to gear geometry, heat treatment, and tooth contact to ensure long-term performance under high torque. By focusing on manufacturing for Subaru applications, Specialised Parts ensures the correct fitment, strength, and reliability needed for conversion builds.

Because compatibility varies depending on the build, buyers need to understand their drivetrain setup and consult with experts before selecting a gear set.

When installed correctly, these reversed gear sets allow for smooth forward motion in mid-engine configurations while maintaining the reliability of a factory-quality setup.

About Specialised Parts

Specialised Parts is a trusted Volkswagen-running Subaru drivetrain auto parts manufacturer producing high-quality components for enthusiasts and builders across the United States. Their products are manufactured for Subaru parts and are compatible with many vehicles that use Subaru-based drivetrains, including custom Volkswagen conversions.

They offer specialized components like reversed ring and pinion gear sets, splined adapters, oil pressure repair kits, short shifter assemblies, and more, all crafted for performance, reliability, and precision fitment.

To learn more about their range of products or to place an order, visit our website or contact us directly through their website.

Building a mid-engine Volkswagen (VW) with a Subaru transmission is a great way to boost performance and create something truly custom. One of the biggest choices you’ll face is which transmission to use.

Subaru’s 4EAT and 5EAT automatic transmissions are both popular among car builders because they are reliable and work well with different setups.

This blog will break down the differences between the 4EAT and 5EAT conversion kits. We’ll help you decide which one is better for your build based on things like cost, power, ease of setup, and driving style.

Whether you’re new to engine swaps or have done a few, this guide will give you the clear information you need to choose the right setup for your project.

Understanding The Basics: 4EAT Vs. 5EAT Transmissions

4EAT (4-Speed Electronic Automatic Transmission)

The 4EAT is a 4-speed automatic transmission developed by Subaru, known for its durability and straightforward design. It has been a staple in Subaru vehicles since the late 1980s, offering a balance between performance and reliability.

Key Features

• Simplicity: Its design is less complex, making it easier to modify and maintain.
• Compatibility: Widely used in various Subaru models, ensuring availability of parts and support.
• Cost-Effective: Generally more affordable than newer transmission models.

5EAT (5-Speed Electronic Automatic Transmission)

Introduced in the early 2000s, the 5EAT is a 5-speed automatic transmission offering improved drivability and smoother gear transitions. It incorporates more advanced electronic controls than the 4EAT and was used in higher-performance Subaru models.

Key Features

• Enhanced Performance: The additional gear allows for more precise acceleration and RPM control.
• Advanced Electronics: Some versions include adaptive shift logic depending on the donor model and ECU.
• Higher Torque Capacity: Designed to handle more powerful engines, making it suitable for performance-oriented builds.

Conversion Kits Overview: Tailoring Transmissions For Mid-Engine VW Builds

4EAT 2WD Conversion Kit

Designed to convert the AWD 4EAT transmission to a 2WD setup suitable for mid-engine applications.

Included Components

• Large back cover plate compatible with VW Vanagon mounts
• Small AWD clutch solenoid passage cover plate
• Bypass resistor for AWD clutch solenoid wires
• Pair of 100 mm axle flanges

Advantages

• Ease of Installation: The kit’s design simplifies the conversion process.
• Cost-Effective: Generally more affordable, making it ideal for budget-conscious projects.
• Proven Reliability: The 4EAT’s track record ensures dependable performance.

Considerations

• Limited Gearing: The 4-speed configuration may not offer the same performance as newer transmissions.
• Older Technology: Lacks some of the advanced features found in modern models.

5EAT 2WD Conversion Kit

Tailored to convert the AWD 5EAT transmission to a 2WD setup for mid-engine configurations.

Included Components

• Large back cover plate with mounting holes
• Output shaft and gear
• Mounting bracket with bolts
• Thrust bearing retaining ring plate
• Pair of Subaru OEM stub axle shafts
• Pair of 100 mm standard-length axle flanges

Advantages

• Improved Performance: The 5-speed gearing offers smoother shifts and improved torque distribution.
• Advanced Features: Some variants support adaptive shifting depending on ECU and model configuration.
• Higher Torque Handling: Suitable for builds using more powerful engines or seeking enhanced road performance.

Considerations

• Complex Installation: The electronic controls may require specific wiring or tuning adjustments.
• Higher Cost: The kit and associated components are typically more expensive than the 4EAT setup.
• Fuel Efficiency: While better RPM management may result in improved drivability, fuel economy gains in converted VW applications may vary depending on weight, gearing, and aerodynamics.

Comparative Analysis: 4EAT Vs. 5EAT Conversion Kits

Feature	4EAT Conversion Kit	5EAT Conversion Kit
Gearing	4-speed	5-speed
Performance	Adequate for standard builds	Enhanced acceleration and drivability
Installation Complexity	Relatively straightforward	More complex due to advanced electronics
Cost	Generally more affordable	Higher cost due to advanced components
Torque Handling	Suitable for moderate power outputs	Designed for higher torque applications
Technology	Older, proven technology	Incorporates more modern features in some models

Making The Right Choice For Your VW Mid-Engine Build

When deciding between the 4EAT and 5EAT conversion kits, consider the following:

• Budget Constraints: If you’re working within a limited budget, the 4EAT kit offers a cost-effective and reliable solution.
• Performance Goals: For high-performance builds or heavier vehicles, the 5EAT provides the gear ratio and torque control needed.
• Technical Expertise: The 4EAT kit’s simpler design is ideal for DIYers. The 5EAT kit, however, may require a professional setup due to its complexity and electronics.
• Donor Vehicle Considerations: Depending on your transmission’s origin (e.g., Outback, Legacy, or Tribeca), electronic compatibility may vary. Confirm ECU and sensor requirements before committing to a 5EAT build.

About Us

At Specialised Parts, we are a leading manufacturer and supplier of VW and Subaru conversion auto parts. Our expertise lies in providing high-quality, custom-manufactured components that meet the needs of enthusiasts and professionals alike.

For more information or to inquire about our products, please visit our website or contact us directly. We’re here to help you get the most out of your Subaru conversion.

Building a Subaru-powered VW conversion is more than a hobby project; it’s an investment in performance, reliability, and the sheer joy of driving something unique. For decades, enthusiasts in the US have chosen Subaru engines for their Volkswagen conversions because of their power, dependability, and compatibility.

But like any finely tuned machine, these conversions require proper care and the right components to last.

Many builders focus on the excitement of the swap itself, but what often determines the success of a conversion is how well it holds up over time. Issues like oil starvation, worn shifters, or improperly installed sensors can shorten the life of your drivetrain and lead to costly repairs.

The good news is that by choosing manufacturer-grade parts and following a proactive maintenance plan, you can dramatically extend the life of your Subaru-powered VW conversion.

In this blog, we’ll lay out proven strategies to increase longevity, from upgrading to high-capacity oil pans and precision oil pressure kits to improving drivetrain performance with short shifter assemblies and custom-fit parts.

Whether you’re a seasoned builder or new to the VW Subaru conversion community, these tips will help you protect your investment and enjoy your build for years to come.

1. Upgrade To A High-Capacity Oil Pan

Prevent Oil Starvation

The Subaru EJ engine’s flat-4 layout can suffer oil starvation during aggressive driving or cornering. A high‑capacity oil pan increases oil volume and ensures consistent oil pickup, especially under dynamic driving conditions.

Improve Cooling & Thermal Stability

With more oil in circulation, your engine benefits from better heat dissipation. That thermal buffer helps keep engine temperatures lower, crucial for preventing heat-induced wear, especially in prolonged or spirited drives.

Protect Underbody & Improve Clearance

Specialised Parts’ oil pans are flat or recessed, designed to resist road debris and improve ground clearance, an advantage in real-world US driving scenarios.

2. Install A Quality Oil Pressure Sensor Repair Kit

Avoid Costly Cylinder Head Damage

Improper sensor installation can lead to overtightened fittings, misalignment, and ultimately, cracked cylinder heads in EJ-253 engines.

Easy, Effective Repair Solution

Specialised Parts offers an oil pressure sensor repair kit that includes all the tools needed, an insert, a drill, a tap, and detailed instructions, so you can remedy issues in under an afternoon.

3. Use A Short Shifter Assembly For Precise, Reliable Shifting

Why Standard Shifters Fall Short

Factory shifters aren’t designed for reversed Subaru transmissions; they suffer from sloppy movement, long throws, and vague engagement.

Designed For Performance

The Short Shifter Assembly from Specialised Parts offers fewer components, stronger alignment, and smoother gear changes, resulting in a more precise and reliable experience. This reduces wear on transmission linkages and improves driver confidence.

4. Stick With Manufacturer-Grade, Custom-Fit Components

Tailored For Your Build

Specialised Parts specializes in building precisely engineered VW–Subaru conversion components, like oil pans, repair kits, and shifter assemblies, that are designed specifically for these swaps.

Better Fit, Less Modification

Using custom parts dramatically reduces the need for adaptation work, meaning cleaner installations, fewer weak points, and lower risk of installation‑related failures.

5. Maintain Regular Checks & Preventive Maintenance

Monitor Oil & Fluid Levels

Check oil levels frequently, especially during initial post-swap break-in and during seasonal changes. Combined with a flexible dipstick and oil pan combo, monitoring becomes faster and more accurate.

Inspect For Wear Points

Regularly inspect the shifter assembly, oil pan, and sensor fittings. Tight mounting hardware and secure positioning reduce vibrations and prevent premature component fatigue.

Keep Shipping & Handling In Mind

Specialised Parts ships domestically (US & Canada) with expedited (3–5 days) and ground (7–14 days) options, enabling you to get replacement parts quickly if needed.

Preventive Maintenance Quick Reference

Maintenance Task	Recommended Interval	Related Product/Upgrade
Check and top up oil levels	Every 1,000 miles	High-capacity oil pan
Change engine oil & filter	Every 3,000–5,000 miles	Subaru oil pan + flexible dipstick combo
Inspect oil pressure sensor & fittings	Every 5,000 miles	Oil pressure repair kit
Inspect and adjust shifter assembly	Every 10,000 miles	Short Shifter Assembly
Inspect ring & pinion wear	Every 12,000 miles	Subaru reversed ring & pinion kits

6. Create An OEM-Inspired Maintenance Schedule

Every 3,000–5,000 miles

• Change the oil with high-quality Subaru-compatible oil.

• Inspect oil pressure sensor and pan for leaks or slosh.

Every 10,000 miles

• Check shifter assembly for play.

• Inspect oil pan condition and mounting.

Annually or every 12,000 miles

• Consider replacing wear items within the shifter kit (covered under 12‑month parts warranty)

• Ensure sensor and adapter integrity, re-tighten and re-align if needed.

About Specialised Parts

Specialised Parts is a leading manufacturer and supplier of converted Volkswagen‑running Subaru drivetrain parts. With a mission to build premium conversion components using top-grade materials and cutting-edge technology, we help VW‑Subaru builders across the US and beyond enjoy long-lasting, high-performance conversions.

Ready to upgrade or need expert advice? Visit our products page or contact us today for OEM-fit parts made specifically for your VW-Subaru conversion.

Across the United States, car enthusiasts and builders are constantly seeking ways to improve the performance and reliability of their Volkswagen conversions. One clear trend has emerged in recent years: Subaru drivetrain parts have become the preferred choice for VW projects.

Their modular design, strength under pressure, and compatibility with Volkswagen platforms make them the leading solution for conversions that demand both durability and precision.

In this blog, we’ll examine the reasons behind Subaru’s dominance in VW conversions, explore the advantages of manufacturer-grade parts, and highlight the specialty components from Specialised Parts that make these projects a success.

The Unique Compatibility Of Subaru Parts

Subaru’s boxer engines and transmission systems offer a compact, low-profile design. This allows them to sit naturally within VW chassis while maintaining proper weight distribution and balance. Many VW models, especially older air-cooled vehicles, benefit from this fit because the Subaru drivetrain can be integrated without excessive modifications.

Another reason Subaru components excel in VW conversions is their modularity. Subaru engines and gearboxes are known for straightforward mounting, and with the right adapters and kits, they align well with VW platforms. This reduces build complexity and increases reliability.

Manufacturer-Grade Solutions Make The Difference

Oil Pressure Repair Kit: Safeguarding Subaru Engines

Oil pressure issues are one of the most common threats to engine longevity. In a VW Subaru conversion, a drop in oil pressure can cause major engine damage. Specialised Parts’ oil pressure repair kit for Subaru engines solves this problem by ensuring consistent oil flow throughout the system.

By stabilizing oil pressure, builders can prevent premature wear and protect their investment.

Short Shifter Assembly: Enhanced Driving Experience

Shifter performance is often overlooked in conversions, but it plays a vital role in how the car feels on the road. Specialised Parts’ short shifter assembly provides crisper, faster, and more precise gear changes compared to standard setups. For enthusiasts who want their VW conversion to feel sporty and responsive, this component is a must-have.

Drivetrain Alignment And Reversed Gear Kits

Solving Compatibility Issues With Reversed Ring And Pinion Kits

One of the biggest challenges in Subaru-to-VW conversions is drivetrain orientation. Without proper gear alignment, reliability suffers. That’s where Specialised Parts’ reversed ring and pinion kits come in.

Available for both Subaru 5-speed 2WD and 5-speed AWD transmissions, these kits allow proper alignment between the Subaru drivetrain and the VW chassis.

Transmission Reliability Through Precision Engineering

Unlike generic solutions, these manufacturer-grade ring and pinion kits are engineered specifically for conversions. This means smoother operation, improved durability, and better long-term performance.

Specialty Transmission Components For Every Build

Subaru Transmission Cap For The Extension Housing

Small details often make the biggest difference. The Subaru transmission cap for the extension housing protects the system from contamination and helps maintain reliability during heavy use.

Splined Adapters: Converting AWD To FWD

For builders who want to switch from AWD to FWD, Specialised Parts manufactures splined adapters compatible with both 5-speed and 6-speed Subaru transmissions. This flexibility allows enthusiasts to configure their VW conversions according to driving style and project goals.

Automatic Transmission Conversion Kits

Not all VW conversion projects are manual. Specialised Parts also offers two specialized automatic kits:

• Subaru automatic transmission 4EAT 2WD kit (reversed rotation) – Ideal for builders needing correct drivetrain rotation.

• Subaru automatic transmission 5EAT 2WD conversion kit (mid-engine application) – Designed for mid-engine builds, a niche but growing trend in US conversions.

These kits open the door to creative projects while ensuring drivetrain compatibility and performance.

Why Subaru Parts Lead The US Conversion Market

Availability And Enthusiast Support

Subaru’s popularity in the US means that replacement parts and aftermarket support are widely available. VW owners who choose Subaru drivetrains gain access to this thriving ecosystem, making long-term maintenance easier and more cost-effective.

Proven Reliability And Power

Subaru’s engineering reputation is built on engines and transmissions that can handle high-performance demands. When paired with Volkswagen chassis, the result is a unique combination of reliability and power that continues to attract conversion enthusiasts nationwide.

Manufacturer-Grade Conversion Parts

Perhaps the most important factor is the rise of specialized manufacturers like Specialised Parts. By producing precision-built conversion components such as oil pressure kits, shifter assemblies, ring and pinion sets, and transmission adapters, they provide VW builders with solutions that are engineered specifically for their needs, ensuring successful builds that last.

About Us

Specialised Parts is a dedicated manufacturer of Volkswagen-running Subaru drivetrain conversion parts. With products including oil pressure repair kits, short shifter assemblies, reversed ring and pinion kits, transmission caps, splined adapters, and automatic conversion kits, the company provides high-quality, precision-engineered components for VW Subaru builds.

Every part is designed to help enthusiasts achieve performance, reliability, and long-term success in their conversion projects. Contact us today to find the right components for your build.

When completing an engine conversion using a Subaru EJ-series engine, every component must be carefully selected for compatibility and long-term performance. One of the most overlooked yet essential components in such builds is the oil pan.

It plays a critical role in managing oil flow, pressure stability, and ground clearance, all of which are vital in a modified application.

For vehicles such as VW Beetles, T3s, Bay Window Vans, and even classic Porsches, the stock Subaru oil pan is often too large or poorly suited for the new chassis layout. In these cases, a properly designed, high-capacity oil pan is not just an upgrade; it is a necessity.

Choosing a solution from a dedicated manufacturer ensures the part was purpose-built for your swap, offering advantages that mass-produced alternatives cannot match.

Why High-Capacity Oil Pans Outperform Stock Versions

Subaru’s OEM EJ-series pans typically hold around 4.2 litres of oil. That might work in factory conditions, but in a custom build, it’s often not enough. More oil means better thermal management, longer oil life, and less risk of oil starvation, especially under load or in high-mileage engines.

Key Benefits Of Increased Capacity

• Better cooling: More oil disperses heat more efficiently

• Stabilized oil pressure: Especially during hard cornering or elevation changes

• Reduced wear on internal components: More oil cushions and lubricates longer

• Compensates for oil consumption: Critical for older engines prone to burning oil

In fact, Specialised Parts’ oil pans offer two high-performance options to meet different build needs and engine conditions, each designed for optimal fit and performance.

Two High-Performance Options To Choose From

Below are two high-performance oil pans to choose from:

Option 1: High-Capacity Oil Pan (Increased Ground Clearance)

• 5.4 litres of oil capacity (vs 4.2L stock)

• 110 mm height (vs 168 mm stock)

• Ideal for moderate-height builds needing more oil and better clearance

Option 2: Ultra High-Capacity Oil Pan (Better Ground Clearance)

• 7.1 litres of oil capacity

• 147 mm height

• Ideal for older, high-mileage EJ engines where oil consumption is a concern

Pro Tip: We recommend Option 2 if you’re running a high-mileage Subaru engine. The extra oil volume compensates for consumption and helps reduce the risk of oil starvation under stress.

Why Dedicated Manufacturers Do It Better

Not all oil pans are created equal. Generic pans are often built to fit everything, which means they’re optimized for nothing. Fitment issues, warped flanges, and poor oil pickup alignment are all common.

When you buy from a dedicated manufacturer like Specialised Parts, you get:

• A product designed specifically for Subaru EJ engine swaps

• Proven fitment for chassis like VW Beetle, Bus, T3, Vanagon, Bay Window, and Split Window Vans

• Precision machining and casting, no guesswork, no compromises

These pans aren’t just rebranded parts. They’re engineered for performance, reliability, and ease of installation.

Built-In Features That Set Our Oil Pan Apart

Specialised Parts has gone the extra mile in designing an oil pan that solves problems, not creates them. Here’s what you get:

Cast Aluminum Construction

The pan is made from cast aluminum, not thin steel or fabricated aluminum. Cast construction provides:

• Exceptional durability under temperature and vibration

• Superior thermal dissipation

• A factory-clean finish

Integrated Cooling Fins

Cooling fins are cast into the body to increase surface area and help keep oil temperatures down, especially during long drives, summer heat, or off-road use.

Reinforced Side Walls

The pan includes cast-in strengthening ribs to reduce flexing and improve durability, especially important for engines under load or in bumpy terrain.

Compact, Clearance-Friendly Profile

Both oil pan options are shorter than the OEM Subaru pan, giving you the clearance you need in tight swaps without sacrificing capacity.

What’s Included With Every Oil Pan

Your purchase isn’t just a pan, it’s a complete solution, packaged with everything you need for installation.

Each oil pan includes:

• Stainless Steel hex-head bolts

• Rubber-bonded steel washers (prevent leaks through bolt holes)

• Magnetic drain plug (captures loose metal particles)

• Drain plug seal

• Shortened oil pickup tube (or standard-length, depending on option)

• Oil pickup O-ring

About Us

Specialised Parts is a leading manufacturer and supplier of conversion auto parts designed for Volkswagen vehicles running Subaru drivetrains. Our mission is simple: to deliver engineered, high-quality solutions that solve real problems in custom builds.

We focus on performance, compatibility, and reliability for DIY builders and conversion shops across North America.

Looking to learn more or check fitment for your specific build? Contact us today; our team is ready to help you get the perfect part for your project.

Cracked cylinder heads in Subaru EJ253 engines are a common and frustrating issue, especially when caused by something as simple as an overtightened oil pressure sensor. If you’re one of the many Subaru owners who have encountered this exact failure, you already know how expensive and time-consuming the fix can be.

The good news? You don’t need to pull the engine, strip the head, or spend thousands at a machine shop.

Our Subaru Oil Pressure Repair Kit is designed to permanently fix this issue in your driveway, with tools, instructions, and inserts that get the job done fast and right the first time.

Why Subaru EJ253 Engines Are Prone To This Problem

The EJ253 engine, commonly found in models like the Subaru Impreza, Outback, and Forester, is known for reliability. However, one weak spot lies in the threads that hold the oil pressure sensor or sender. These threads are tapped directly into the aluminum cylinder head, which can easily crack if the sensor is overtightened or cross-threaded.

Once cracked, the head is compromised. You may lose oil pressure readings, develop leaks, or trigger engine warning lights. Worse yet, some mechanics will quote full head removal or replacement to fix it, a costly and unnecessary repair.

Our Solution: The Subaru Oil Pressure Sensor Repair Kit

Our Subaru Oil Pressure Repair Kit was developed for Subaru enthusiasts, mechanics, and DIYers who want a permanent fix without removing the head from the car. The kit is fully compatible with Subaru EJ253 engines, which are used in thousands of vehicles across North America.

It includes everything needed to restore the integrity of the sensor port and keep your oil pressure readings accurate and leak-free.

What’s Included In The Kit?

Each kit contains high-quality tools and components needed to complete the repair in a few hours:

• Oil Pressure Repair Insert (custom machined)

• Drill

• Drill Stop (prevents over-drilling into the cylinder head)

• Tap (to create new threads for the insert)

• Detailed step-by-step instructions with colour photos

Whether you’re a hobbyist or a technician, this kit empowers you to fix your cylinder head confidently and correctly.

How The Repair Process Works

The repair process is designed to be straightforward and effective, using simple hand tools and basic mechanical skills.

Passenger Side Cylinder Head

If the crack is on the passenger side of the engine, the repair is relatively simple. You’ll only need:

• Basic hand tools

• Drill (included)

• Tap handle

• Extension

• Thread sealant

Following the instructions, you’ll drill out the damaged threads, re-tap the hole, and insert the new pressure-safe insert. This ensures a perfect fit for your sensor and restores function to OEM standards.

Driver Side Cylinder Head

This side is more involved, but still doable for mechanically inclined Subaru owners. Because the timing system sits in front of the driver-side cylinder head, you’ll need to remove:

• Timing belt

• Tensioner

• Cam gear

You’ll also need good mechanical knowledge or a qualified helper, but the results are the same: no more cracked heads and no more faulty pressure readings.

Important Fitment Notes

• This kit is only compatible with Subaru EJ253 engines

• Due to the precision nature of this repair, kits are final sale

• Returns are not accepted, so please ensure compatibility before ordering

• If you’re unsure, reach out to our team to verify fitment

About Us

At Specialised Parts, we manufacture purpose-built auto parts designed for Subaru-powered builds and Volkswagen drivetrain conversions. We focus on high-performance, problem-solving components that are trusted by both hobbyists and professional builders across North America.

Our products are engineered with real-world compatibility and reliability in mind, no gimmicks, no shortcuts. Whether you’re restoring oil pressure in a Subaru engine or building a Vanagon with a reversed transmission setup, we’ve got you covered.

Have questions about this kit? Reach out to our team through our website. We’re here to help.

Frequently Asked Questions

Can I Do The Repair Myself Without Removing The Engine?

Yes. The kit allows you to fix the cracked sensor threads without pulling the head or engine. Most users can complete the repair in an afternoon.

What Tools Do I Need For The Install?

The kit includes a drill, tap, and insert. You’ll need hand tools, sealant, and a tap handle. The driver-side repair requires timing component removal.

What If I’m Not Sure I Need This Repair Kit?

If your oil pressure sensor threads are stripped or leaking, this kit is the fastest and most cost-effective way to restore a reliable seal.

Swapping a Subaru engine into a classic Volkswagen is one of the most exciting modifications a car enthusiast can take on. But as anyone who’s ever tackled a conversion build knows, the success of that swap depends heavily on one critical factor, the quality of your Subaru swap kit.

Not all kits are equally great. A great Subaru conversion kit is more than just a collection of parts; it’s a carefully engineered solution designed to deliver seamless performance, mechanical reliability, and long-term durability.

In this blog, we’ll break down what actually makes a Subaru swap kit worth your time and money, from oil management and shifting systems to fitment engineering and compatibility.

Key Components That Define A High-Quality Subaru Swap Kit

To understand what makes a swap kit great, we need to examine the core components that matter most during and after installation.

Engine Compatibility And Mounting Hardware

A swap kit must accommodate multiple Subaru engine variants, like the EJ20, EJ22, and EJ25 series, with precision-cut mounting hardware that lines up cleanly in VW chassis. Proper spacing and bolt-on compatibility reduce install time and avoid future alignment issues.

Key technical detail: Kits that require cutting, welding, or re-drilling increase the risk of failure and cost more in labor. Look for conversion kits designed with vehicle-specific tolerances in mind.

Custom Oil Pans: Clearance And Performance

Another major element in a proper swap is the oil pan. OEM Subaru pans are not designed to sit comfortably in VW engine bays. A custom-fabricated oil pan for conversions provides:

• Increased ground clearance
• Correct oil pickup alignment

Short Shifter Assemblies: Shifting Matters More Than You Think

After installing your Subaru drivetrain, one of the most noticeable changes happens at the shifter. Long, imprecise throws ruin the experience. A short shifter assembly transforms your driving dynamics by:

• Reducing shift throw distance
• Increasing precision during gear changes
• Providing durability under torque-heavy swaps

Shifters built specifically for Subaru gearboxes used in VW bodies ensure proper linkage fit and long-term performance. A quality short shifter improves both daily drivability and aggressive performance driving.

Machining And Fabrication Quality

A swap kit isn’t just about the parts included; it’s about how those parts are made. Look for:

• CNC-machined components
• Laser-cut flanges
• TIG-welded brackets
• Rust-proof coating or anodization

All these elements speak to the quality control and mechanical confidence you can place in the system. Precision fabrication reduces the chance of failure and boosts longevity.

Key Considerations When Choosing A Swap Kit

Fitment And Compatibility

Every VW chassis is different. Your Subaru swap kit should offer options or universal compatibility for:

• Bay Window Buses
• Bugs
• Vanagons
• Early T2s or T3s

Proper instructions and layout diagrams should accompany any conversion kit to reduce guesswork during install.

Performance Under Real-World Conditions

The kit should be tested for heat management, oiling reliability, and drivetrain geometry under various loads. Check for:

• Dyno-tested data or real-world testimonials
• Fitment with off-road or lifted configurations
• Compatibility with cooling upgrades and shift system tuning

Upgrade Potential And Modular Design

You may start with a basic build and decide to add turbochargers, upgraded ECUs, or new drivetrain components later. A modular swap kit allows:

• Easy integration of new parts
• Future-proofing for power upgrades
• Compatibility with aftermarket Subaru performance parts

About Us

Specialised Parts is a leading manufacturer of VW and Subaru conversion auto parts, offering purpose-built components that are precision-engineered for real-world performance.

Based in the U.S., our team is dedicated to creating high-performance, long-lasting products that simplify the VW-Subaru engine swap process. Whether you’re restoring a vintage Beetle or upgrading a Vanagon for off-road adventures, we provide the exact-fit parts you need for a clean, reliable installation.

Our product line includes exclusive designs like our oil pressure kit and short shifter assembly, which are engineered for performance and durability under real-world driving conditions. We also manufacture high-quality oil pans, engine brackets, mounts, and more, all designed for compatibility with Subaru engines used in VW conversions.

If you’re planning a Subaru engine swap for your VW, explore our full product lineup or contact us with your build questions. Explore our growing inventory and experience the difference that true manufacturing expertise brings to your next conversion project.

Subaru engine swaps into Volkswagen platforms have gained significant popularity among builders seeking improved reliability and power output.

The compact, flat design of Subaru engines, combined with their strong after-market support, makes them a practical choice for performance conversions. When properly configured, these drivetrains offer a balance of efficiency, torque, and long-term durability.

However, a successful Subaru-to-VW conversion requires more than just mechanical compatibility. Builders must address critical factors such as transmission configuration, gear rotation, and shifter functionality.

Without the right components in place, even a well-intentioned build can experience premature failure or compromised drivability.

This blog outlines the essential parts required to complete a Subaru-powered VW conversion correctly. Each item listed, provided by Specialised Parts, serves a specific function to enhance system reliability, protect mechanical components, and ensure proper integration.

Dial In The Right Transmission Configuration

Most Subaru transmissions are built for all-wheel drive, which works great in a factory WRX, but not so much in a VW Vanagon or rear-drive kit car. Unless you’re running full-time AWD (which is rare in these builds), you’ll want to convert the transmission to two-wheel drive for simplicity, weight savings, and drivetrain efficiency.

A splined adapter allows you to do this easily, using your existing 5-speed or 6-speed Subaru transmission. It eliminates the rear output, effectively turning your AWD box into a FWD unit, no full transmission swap needed.

Once the AWD system is removed, don’t leave the transmission exposed. An extension housing cap is essential to seal off the open output.

Without this, you’re risking oil leaks, dirt intrusion, and eventual internal damage. Together, the adapter and cap create a clean and reliable two-wheel drive-ready transmission built specifically for Subaru-to-VW applications.

Correct Gear Rotation For Mid-Engine Layouts

One of the trickier issues in these conversions is the rotation direction. When a Subaru drivetrain is placed into a mid-engine configuration, especially in a kit car or sand rail, the gears often end up spinning the wrong way. If left uncorrected, the result is exactly what you think: the car drives backward.

The solution? A reversed ring and pinion gearset designed for your specific layout. Builders running a 2WD mid-engine setup will need a gearset engineered for that orientation. If you’re maintaining an AWD layout but still need reverse rotation, there’s a separate reversed set just for you.

These gearsets are purpose-built and heat-treated for durability. More importantly, they’re not generic. They’re engineered for Subaru-based conversions and tested under real-world loads, ensuring reliability in even the most demanding builds.

Make the Drive Feel Right With A Short Shifter For Your VW Vanagon

Swapping engines is only part of the experience; how it feels to drive matters just as much. One area where many swaps fall short is the shifter. Subaru transmissions tend to have longer, softer throws compared to what VW drivers are used to. This disconnect can make even a well-built car feel sloppy.

A short shifter assembly designed for conversion use drastically improves shift precision in your VW Vanagon with a Subaru 5-speed transmission. It shortens the throw distance, tightens the engagement, and makes gear changes snappier and more intuitive. It’s not just about speed, it’s about control.

For any serious builder, upgrading the shifter should be a priority. After all, it’s the part you interact with most once the build is complete.

Complete Swap Parts Checklist

Below is a quick-reference checklist of the most essential parts for a Subaru-powered VW conversion. Each of these addresses a real-world problem that could otherwise compromise your build.

Component	Why It Matters
Splined AWD-to-2WD Adapter	Converts Subaru transmission for 2WD configurations
Transmission Cap	Seals off the open extension housing to prevent leaks and contamination
Reversed Ring & Pinion (2WD)	Reverses output direction in mid-engine, 2WD builds
Reversed Ring & Pinion (AWD)	Reverses rotation for AWD Subaru conversions
4EAT/5EAT Conversion Kits	Adapts automatic transmissions for reverse, mid-engine setups
Short Shifter Assembly for your VW Vanagon with a Subaru 5 speed transmission	Improves shifter feel and gear precision

About Specialised Parts

At Specialised Parts, we manufacture performance components designed exclusively for Subaru drivetrain swaps into VW vehicles. Our catalogue includes oil pressure kits, reverse gearsets, shifter upgrades, and transmission adapters, all engineered by experts who build and test these parts themselves.

We don’t sell generic auto parts. We serve a focused community of builders who demand precision, longevity, and real-world performance. If you’re planning or upgrading a Subaru-powered VW, reach out to our team today to get expert help and proven parts.

For more information, visit our website.

If you’re a Volkswagen enthusiast, chances are you’ve dreamt of building a high-performance VW that offers the perfect blend of power, reliability, and a unique driving experience. One of the most exciting ways to achieve this is by combining the classic VW styling and engineering with the advanced, performance-driven components of a Subaru drivetrain.

Subaru’s innovative engineering, especially in their engines and transmissions, has made them a popular choice for those looking to upgrade or convert their VW vehicles. In this blog, we’ll explore how to build a high-performance VW using Subaru drivetrain parts, focusing on the benefits, key components, and tips to get the best results.

The Benefits Of Using Subaru Drivetrain Parts In A VW Build

When it comes to performance upgrades, using Subaru drivetrain parts in a VW build offers several advantages:

• Enhanced Power and Performance: Subaru’s engines, especially the EJ and FB series, are known for their robust power output and torque. Coupling a Subaru drivetrain with a VW chassis can give your vehicle a significant performance boost without compromising reliability.

• Advanced All-Wheel Drive Capabilities: Subaru’s symmetrical all-wheel-drive (AWD) systems are renowned for their handling and traction, making them an ideal choice for those looking to enhance their VW’s handling in various road conditions.

• Reliability and Durability: Subaru engines and transmissions are designed for longevity, with a reputation for being able to handle significant power and stress. This is particularly advantageous for those looking to create a vehicle capable of withstanding intense driving conditions.

• Aftermarket Support: Subaru’s popularity in motorsports and the aftermarket world means that you can find a wealth of parts and resources to fine-tune and customize your build. Whether it’s for engine tuning, suspension upgrades, or drivetrain components, there’s a large pool of aftermarket parts and expertise available.

Key Subaru Drivetrain Components For Your VW Build

Building a high-performance VW with a Subaru drivetrain requires careful selection of parts. Below, we explore some of the key components that will take your VW build to the next level.

1. Subaru EJ Engine

The Subaru EJ engine series, which includes the EJ20, EJ22, EJ25, and more, is a popular choice for engine swaps into various vehicles, including VW models. Known for its durability, efficiency, and high-revving nature, the EJ engine provides plenty of power for a variety of performance builds.

• Benefits of the EJ Engine: The EJ engine offers a balance of high torque at low RPMs and the ability to handle high boost pressure, making it ideal for turbocharging. It’s capable of producing impressive horsepower numbers while maintaining fuel efficiency compared to some other performance engines.

• Installation Considerations: When swapping an EJ engine into a VW, you’ll need custom motor mounts and potentially modifications to the engine bay to fit the engine properly. It’s also essential to choose the right transmission to match the engine’s power and torque output.

2. High-Capacity Oil Pan For Subaru Engines

One of the essential upgrades when building a high-performance VW with Subaru drivetrain parts is a high-capacity oil pan. A high-capacity oil pan increases the engine’s oil volume, providing better lubrication during high-performance driving and reducing the risk of oil starvation under extreme conditions.

• Why It’s Important: When you’re pushing an engine to its limits, oil starvation can cause severe damage to the engine. A larger oil pan ensures that the engine has a steady supply of oil, even under high-G cornering or heavy acceleration, helping to maintain consistent engine performance.

• Product Recommendation: The high-capacity oil pan from Specialised Parts is specifically designed for Subaru engine swaps, providing optimal performance and durability.

3. Subaru Rear Differential

The rear differential is another crucial component when building a high-performance VW with Subaru parts. Subaru’s rear differentials, especially those found in the WRX and STI models, are built to handle the power generated by their turbocharged engines, making them an excellent option for performance-focused builds.

• Why the Subaru Rear Differential? These differentials offer strength, reliability, and excellent power distribution, making them ideal for driving conditions that require heavy torque handling. Additionally, they allow for customization with various gear ratios, giving you the ability to fine-tune the performance of your build.
• All-Wheel Drive Considerations: If you’re incorporating an all-wheel-drive (AWD) system, the Subaru rear differential is crucial in achieving balanced power delivery to all four wheels. This setup improves traction, handling, and stability, particularly when cornering at high speeds.

Other Performance Parts To Consider For Your VW-Subaru Build

While the drivetrain is central to the build, there are other performance components you should consider to ensure that your high-performance VW performs optimally.

Suspension Upgrades

When you’re increasing engine power and improving handling, suspension upgrades are essential. Subaru’s suspension components are known for their reliability and performance, especially in models like the WRX and STI. These components can be adapted for your VW build, providing improved handling, ride quality, and stability at higher speeds.

Braking System

Upgrading the braking system is crucial when building a high-performance vehicle. Subaru’s high-performance braking systems, found on models like the WRX STI, offer excellent stopping power, especially under extreme driving conditions. Upgrading to Subaru’s performance brakes will allow you to safely handle the increased speeds and performance that come with a Subaru drivetrain.

Exhaust System

An upgraded exhaust system will enhance your engine’s breathing, allowing it to operate more efficiently and produce more power. The Subaru WRX STI exhaust system, for example, is known for its robust sound and high flow, making it a great option for high-performance builds.

Tips For A Successful VW-Subaru Drivetrain Build

Building a high-performance VW with Subaru drivetrain parts is a challenging yet rewarding endeavour. To ensure a successful build, here are some tips to keep in mind:

1. Plan and Research Thoroughly: Understand the compatibility of the parts you plan to use, as not all Subaru components are directly interchangeable with VW models. Proper planning will help prevent costly mistakes and unnecessary modifications.

1. Choose the Right Transmission: The right transmission will ensure that your engine performs optimally. Subaru’s 5-speed and 6-speed transmissions are solid choices, but be sure to choose one that matches the power output of your engine.

1. Engine Management: Proper engine management is crucial when swapping a Subaru engine into a VW. Make sure to invest in a quality engine control unit (ECU) and tune it for the specific combination of parts you’re using. This will maximize performance and fuel efficiency.

1. Use Quality Aftermarket Parts: While OEM parts are great, performance-focused aftermarket parts will give your VW build the edge it needs. Look for components designed for high-performance applications to ensure longevity and durability.

About Us

At Specialised Parts, we specialize in Volkswagen-running Subaru drivetrain auto parts, offering high-performance components like oil pressure kits, short shifters, and oil pans.

We’re dedicated to providing enthusiasts with the best products for Subaru engine conversions, ensuring that your VW build is equipped with parts designed for power and longevity. Whether you’re upgrading your transmission or swapping engines, our expert team is here to help.

Contact us today to find out more about our parts or consult with our team to get started on your high-performance VW conversion.