WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT

WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT – Power, Precision, and Reliability

There’s a reason Subaru’s WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT is legendary. Designed to handle aggressive launches, high horsepower builds, and long-haul reliability, this gear set is the backbone of what makes the STI one of the most respected performance cars in the world. If your transmission is grinding, slipping, or simply can’t keep up with your build, upgrading or replacing it with this OEM gear set ensures your WRX STI stays sharp, precise, and track-ready.

Forget aftermarket kits that cut corners—this is the real deal, built to exact Subaru standards. Whether you’re restoring your STI to factory perfection or preparing for serious power upgrades, the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT gives you bulletproof reliability and the crisp engagement you expect from Subaru’s iconic 6MT.

What Exactly Is the WRX STI 6 Speed Transmission Gear Set 6MT?

This gear set is the heart of Subaru’s high-performance 6-speed manual transmission. It includes the OEM gears, synchronizers, hubs, and shafts that make up the transmission’s internal components. Subaru’s engineering ensures each part is built to withstand high torque loads, rapid shifts, and demanding driving conditions.

The 6MT transmission became famous for its strength compared to the weaker 5MT used in non-STI models. For enthusiasts, upgrading or replacing with the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT is more than just maintenance—it’s peace of mind. Whether you’re daily driving, drag racing, or carving up canyon roads, this gear set ensures your drivetrain is ready for the challenge.

Why Enthusiasts Choose the STI 6MT Gear Set

• Proven Strength – Capable of handling high horsepower and torque applications.

• OEM Reliability – Built to Subaru’s strict factory specs, ensuring long service life.

• Performance Feel – Crisp, positive engagement every time you shift.

• Upgrade Potential – Perfect for stock rebuilds or as a foundation for high-power builds.

• Preserves Resale Value – Keeping OEM components maintains the authenticity and value of your Subaru.

The WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT is often referred to as “bulletproof” in enthusiast circles. When properly installed and maintained, it’s nearly indestructible—making it one of the most trusted gearboxes in the performance car world.

Where Does This Gear Set Fit?

The WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT is designed specifically for Subaru STI models equipped with the 6MT transmission. Depending on the year, compatibility may vary slightly, but this gear set is the OEM solution for factory-correct rebuilds.

If you own a WRX with a 5MT and are considering an upgrade, this is the gear set you need as part of a 6MT swap. Subaru enthusiasts often swap to the 6MT when building higher horsepower cars, since the 5MT is prone to failure under heavy loads. With this gear set, you can complete a swap or rebuild and enjoy factory-level fitment and strength.

Installation: What to Expect

Installing the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT requires precision and mechanical knowledge. This isn’t a simple bolt-on part—it involves a full transmission tear-down and rebuild. Here’s a general overview:

1. Transmission Removal – The transmission must be removed from the vehicle.

2. Disassembly – The old gears, synchros, and hubs are removed.

3. Inspection – Shafts, bearings, and cases are inspected for wear.

4. New Gear Set Install – Each component of the 6MT gear set is carefully installed.

5. Reassembly & Testing – The transmission is sealed, refilled, and tested for smooth shifting.

Because this process requires special tools and experience, professional installation is strongly recommended. If you’re a DIY enthusiast with transmission rebuild experience, it’s possible to tackle the job yourself, but precision is key to ensuring long-term reliability.

Benefits of Choosing OEM Subaru Gear Sets

• Engineered for Subaru Power – Designed to handle the turbocharged power of the EJ25.

• Factory Fitment – Perfect drop-in replacement with no guesswork.

• Long-Term Reliability – Built to endure daily use and spirited driving.

• Proven Track Record – The STI 6MT has powered everything from rally cars to 600+ HP street builds.

Aftermarket gear sets may claim strength, but they often sacrifice drivability or reliability. With the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT, you know exactly what you’re getting: Subaru’s trusted engineering.

Frequently Asked Questions (FAQ)

Q1: Can I install the WRX STI 6 Speed Transmission Gear Set 6MT myself?
A: If you’re highly skilled with transmission work, yes—but for most Subaru owners, professional installation is recommended. Rebuilding a 6MT requires specialized tools and knowledge.

Q2: Will this gear set fit a non-STI WRX?
A: Not directly. WRX models use a 5MT, so you’d need to perform a 6MT swap. This gear set is ideal for rebuilds or upgrades on STI models but can also be part of a WRX swap project.

Q3: How strong is the OEM WRX STI 6MT compared to aftermarket options?
A: The OEM STI 6MT is regarded as one of the strongest factory manual transmissions available. Many owners run 500+ HP on stock gear sets with proper tuning and driving habits.

Why This Gear Set Is Worth It

Think about it: your transmission is the link between your Subaru’s turbocharged engine and all-wheel drive system. Without a reliable gear set, even the most powerful build is useless. By investing in the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT, you’re ensuring every shift is crisp, every launch is confident, and every drive is built on proven reliability.

Whether you’re restoring your STI back to OEM condition or building a high-horsepower monster, this gear set is the ultimate foundation. It’s more than just replacement parts—it’s peace of mind for every mile ahead.

A Question for You

Isn’t it time your Subaru’s transmission matched the performance of its engine? Could the WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT be the upgrade that transforms your build from quick to truly unstoppable?

To build a complete drivetrain upgrade, consider pairing this gear set with other OEM Subaru performance parts on Genuine Subie Parts:

• Explore our WRX STI drivetrain components for OEM upgrades.

• Pair with STI clutch kits for smooth and reliable power delivery.

• Shop our complete WRX STI OEM replacement parts to keep your build factory-true.

Final Thoughts

The WRX STI 6 SPEED TRANSMISSION GEAR SET 6MT isn’t just a replacement—it’s a cornerstone of Subaru’s legendary performance. Built for strength, precision, and longevity, this gear set ensures your STI stays reliable no matter how hard you push it.

Whether you’re performing a stock rebuild, tackling a 6MT swap, or preparing for high-horsepower power levels, this OEM gear set gives you the confidence to drive harder, faster, and smarter.

Don’t risk your build with inferior parts—choose Subaru OEM and experience the bulletproof reliability of the WRX STI 6MT.

Components only. Suitable solely for replacement or repairs. This is not a complete working item. The gears are in excellent condition and ideal for parts.