Level up your boosted build with the holy grail of turbocharged Subie drivetrains. This subaru legacy gt 6 speed setup is the absolute move if you want to hold high horsepower without stripping gears. Sourced directly from low-mileage Japanese donor cars, this high-performance subaru spec b transmission gives you bulletproof durability over weak stock 5-speed boxes. Built around the legendary TY856 architecture, this subaru legacy gt transmission upgrade is totally unmatchable.
Spec B 6-Speed + R180 LSD Overview
Turbocharged EJ engines demand a gearbox that won't snap under sudden torque load. This JDM Spec B setup offers thicker gearsets, revised synchros, and superior thermal management. Coupled with the included high-bias R180 mechanical limited-slip rear differential, your car will dig into corners and shoot out with maximum grip. Say goodbye to wheelspin and hello to aggressive track-ready power delivery.
Specifications (Final Drive, R180, LSD)
- Gearbox Code: TY856 Series 6-Speed Manual
- Final Drive Ratio: 3.70 (Optimized for Turbo EJ Powerbands)
- Rear Differential: Heavy-Duty R180 with Factory LSD
- Clutch Style: Pull-Type Clutch Assembly
- AWD System: Symmetrical Full-Time AWD
Fitment — Legacy GT Spec B
This transmission is tailored specifically for boosted EJ-series engines. Check the fitment chart below for exact compatibility.
|
Year Range |
Model |
Engine Code |
Fitment Type |
Notes |
|
2006–2009 |
Subaru Legacy GT Spec B |
EJ255 2.5L Turbo |
Direct Fit |
Factory Spec Match |
|
2005–2009 |
Subaru Legacy GT |
EJ255 2.5L Turbo |
Direct Upgrade |
Includes R180 Rear Diff |
|
2004–2008 |
Subaru Forester XT |
EJ255 2.5L Turbo |
Custom Swap |
Requires Axle Adjustments |
Tested & Ready to Install
Every gearbox shipped out by DMV JDM Depot undergoes extensive mechanical checks. Sourced from Japan with 55,000 to 65,000 miles, this unit is prepped for action.
- Bench Tested: Verified gear rotation through all 6 forward gears and reverse.
- Fluid Clean Check: Inspected drain plug magnet for metal debris or signs of severe wear.
- Housing Inspection: Inspected mounting tabs, bellhousing threads, and casing seals.
What’s Included & Installation Notes
This is a complete drivetrain package designed for enthusiasts who want maximum performance:
- Package Contents: 6-speed manual gearbox + matching 3.70 final drive R180 LSD differential.
- Sensor Transfer: You must reuse your original neutral safety and reverse sensors from your old transmission.
- Seal Replacement: Replace your front input shaft seal and rear tail-shaft seal prior to installation.
- Drivetrain Alignment: Ensure your propshaft matches the 3.70 R180 flange interface.
Why Buy From DMV JDM Depot?
We take the stress out of ordering imported performance car parts. When you shop with DMV JDM Depot, you get top-tier JDM gear without the mystery.
- 30-Day Warranty: Standard 30-day coverage protects against major internal defects.
- Same-Day Dispatch: Fast freight processing shipping right to your door in the lower 48 states.
- FIT Verification: Send us your VIN to confirm gear ratios before shipping out.
Browse our entire Subaru Transmissions library or check the general JDM Transmissions collection. Need the 3.90 ratio EZ30 engine version? See our Subaru Legacy/Outback Spec B 6-speed (3.90 / EZ30). Learn more with our post on How to Inspect a Used Engine/Transmission Before You Buy.
Frequently Asked Questions
Will this 6-speed fit my Subaru Legacy GT Spec B?
Yes, it is a direct bolt-on swap for turbo EJ-series Legacy GT and Spec B models.
Does it include the R180 rear differential and LSD?
Yes, this complete bundle comes with the high-performance R180 rear diff featuring a mechanical LSD.
Is the final-drive ratio 3.70 or 3.90?
This specific Legacy GT unit features the factory-correct 3.70 final drive ratio for longer gears and higher top-end speeds.
Is this a JDM used transmission, and what mileage does it have?
It is an imported JDM transmission with approximately 55,000 to 65,000 original miles.
What's the difference between this GT Spec B unit and the Outback/3.0R 6-speed?
The GT Spec B uses a 3.70 final drive meant for turbo EJ motors, whereas the Outback/3.0R uses a 3.90 ratio.