This is the Subaru WRX STI 6-speed manual transaxle, model TY856WB1CA. It is a close-ratio gearbox built to handle the STI's torque, with a driver-controlled center differential (DCCD) and a short-throw shifter.
The STI 6-speed was used across the 2004 to 2007 GD cars and the 2008 to 2014 GR and GV cars. The exact unit is not identical across those years. The final drive ratio, the DCCD type, the clutch type, and the speed-sensor and ABS setup can differ, so confirm the exact unit and your car's chassis by VIN.
Because this is an AWD transaxle, the transmission's final drive must match the rear differential ratio. If you change one, you must match the other. Confirm what is included (DCCD components and front diff) before you order.
| Item | Details |
|---|---|
| Chassis | GD (2004 to 2007) versus GR/GV (2008 to 2014); confirm by VIN |
| Final drive and DCCD | Must match your rear diff and DCCD type |
| Clutch type | Pull versus push type varies by year |
Confirm the exact unit by year and chassis (GD versus GR/GV) by VIN.
Confirm the final drive ratio matches your rear differential.
Confirm the DCCD type and that the controller and components are included.
Confirm the clutch type (pull versus push) for your car.
| Item | Details |
|---|---|
| INCLUDED | The STI 6-speed transaxle (TY856WB1CA) with its integrated front differential and DCCD center differential as confirmed. Call to confirm whether the DCCD controller and related components are included for your application. |
| NOT INCLUDED | Clutch kit, flywheel, axles, rear differential, fluid, and any DCCD controller or wiring are not included unless specifically confirmed in writing. |
| Tools You Need | Professional installation recommended. Match the final drive to the rear differential, confirm the clutch type, and set up the DCCD correctly for your chassis. |
This transaxle fits the Subaru WRX STI. Confirm the exact unit by chassis, because the years differ in final drive, DCCD, and clutch type.
| Vehicle | Compatibility |
|---|---|
| 2004 to 2007 WRX STI | GD chassis (EJ25 turbo) |
| 2008 to 2014 WRX STI | GR and GV chassis (EJ25 turbo) |
| Confirm | Final drive and DCCD must match your car |
The STI 6-speed fits the 2004 to 2007 GD and the 2008 to 2014 GR and GV WRX STI. A 2007 GD unit is not always a plug-in swap for a later GR car, because the final drive, DCCD type, clutch type, and speed-sensor setup can differ. Confirm the exact unit and your chassis by VIN before you order.
Not sure which STI 6-speed your car needs? Call (240) 301-0095 or email support@vazautosolutions.com with your VIN and chassis. We will help confirm the exact unit, the final drive, the DCCD type, and what is included.
Quality control for this part includes:
Because this is a used performance transaxle, we check the synchros and bearings, verify that it shifts cleanly through all gears, and confirm DCCD function, documenting mileage and donor history where known. Request details before purchase.
| Model | TY856WB1CA |
|---|---|
| Type | 6-speed manual AWD transaxle |
| Maker | Subaru |
| Center Differential | Driver-controlled (DCCD) |
| Gear Ratios | 1st 3.454, 2nd 2.357, 3rd 1.684, 4th 1.307, 5th 1.000, 6th 0.738 |
| Input Shaft Splines | 24 |
| Output Shaft Splines | 27 |
| Fluid Type | Subaru Extra-S |
| Fluid Capacity | About 2.4 liters (2.5 quarts) |
| Bellhousing To Tailshaft | About 16.5 in |
| Weight | About 130 lbs |
| Capacity | Stout, high-capacity gearbox; exact limit depends on clutch and use |
| Sku | vaz280 |
Contact (240) 301-0095 within 15 days of delivery.
