JDM Version 9 STI 6MT DCCD Transmission and Swap Package

The Version 9 was the final evolution of the GD-chassis Impreza WRX STI, and it benefited from years of rally-bred updates. This package brings that drivetrain to your build. At its heart is a JDM Version 9 STI 6MT DCCD transmission, code TY856WB8KD. In addition, it includes a front limited-slip diff, an R180 Torsen rear LSD, R180 axles, Brembo-equipped 5×114,3 hubs on all four corners, a 6MT driveshaft and both subframes. As a result, you start your conversion with a matched set of genuine STI parts.

Why Version 9?

Subaru refined the STI drivetrain with each version. By Version 9, the 6-speed and DCCD system were fully developed, proven in rally and on track. Therefore, many builders look specifically for Version 9 parts when planning a serious conversion. Moreover, the strong STI 6-speed handles far more power than the WRX 5-speed, so it’s the right foundation for a high-output build.

Traction from Front to Rear

This package gives you three levels of traction control. First, the DCCD center differential lets you adjust how power splits between the front and rear axles. Second, the front limited-slip diff helps pull the car out of corners. Third, the R180 Torsen rear LSD shares torque between the rear wheels smoothly and automatically. Together, they put power down cleanly on dry pavement, in rain and in snow.

5×100 Hubs for WRX Owners

The included hubs use the 5×114,3 bolt pattern, the same as the 2005–2007 WRX STI. So, if you already run 5×114,3 wheels, you may be able to keep them, as long as they clear the Brembo calipers. Plus, four-corner Brembo brakes give you stopping power to match the STI drivetrain.

About DCCD

A DCCD transmission needs a DCCD controller and wiring to control the center differential. However, these aren’t included unless shown in the photos. Therefore, plan to source a controller, or ask us about options when you order.

Fitment

• 2002–2007 Subaru Impreza WRX sedan (GD): STI drivetrain conversion
• Wheels must clear the Brembo calipers and match the 5×114,3 bolt pattern
• DCCD controller and wiring required for full function

Every build is different, so send us your VIN and plans, and we’ll help you finish the parts list. For background, see the Subaru Impreza WRX STI overview.

Swap Checklist

1. Confirm the front and rear final drive ratios match.
2. Fill the transmission and rear diff with fresh gear oil of the correct grade.
3. Install a clutch, flywheel and shifter suited to the STI 6-speed.
4. Bleed the brakes and inspect every hub bearing and CV boot.
5. Install and test the DCCD controller and wiring.
6. Finish with a professional alignment.

Professional Installation Available

Want it done right the first time? J-Spec Auto Sports installs the engines, transmissions and parts we sell at our shop in Henrico, Virginia, near Richmond. We perform complete STI drivetrain conversions, from subframes and hubs to DCCD wiring and alignment. To get a quote or book a time, schedule an appointment or call 866-683-3747.

Shipping and Pickup

We palletize this large, multi-piece package carefully and ship it by freight anywhere in the continental US. Given its size, local pickup at our Henrico shop is also a great option.

FAQ

What makes Version 9 special?
It was the final GD-chassis STI, with the most refined version of the 6-speed and DCCD drivetrain.

What rear diff is included?
An R180 Torsen limited-slip differential, plus R180 axles.

What bolt pattern are the hubs?
5×114,3, the same as the 2005–2007 WRX STI.

Is the DCCD controller included?
No, unless it’s shown in the photos.

Will my wheels fit?
They must clear the Brembo calipers and match the 5×114,3 pattern.

Can you install the full swap?
Yes, at our Henrico, VA shop. Call 866-683-3747.