Complete JDM STI Version 8 DCCD 6-Speed Swap for 2002–2007 WRX

Converting a WRX to STI running gear usually means months of searching for the transmission, diffs, hubs, axles and subframes, then discovering a missing piece halfway through the build. This complete STI 6-speed swap avoids all of that. It’s built around a JDM Subaru Impreza WRX STI Version 8 DCCD transmission, code TY856WB3KA, and it includes the major parts you need in one package. As a result, your swap starts with matched, genuine STI components.

What’s Included

• STI Version 8 DCCD 6-speed transmission, TY856WB3KA
• Front Suretrac helical limited-slip differential
• Rear R180 limited-slip differential and R180 axles
• Front axles
• Four-corner 5×100 hubs with Brembo calipers
• 6MT driveshaft and 6MT shifter
• Used 6MT flywheel and STI transmission cradle
• Front aluminum control arms
• Rear trailing arms and rear lateral links
• Front and rear subframes

Why the STI Drivetrain Is the Ultimate WRX Upgrade

The WRX 5-speed is the weak link in many builds, especially once power goes up. In contrast, the STI 6-speed is far stronger and adds a sixth gear for closer ratios. Moreover, the DCCD (Driver Controlled Center Differential) lets you adjust how power splits front to rear. In addition, the front Suretrac and rear R180 limited-slip differentials put power down cleanly out of corners. Finally, the Brembo brakes give you stopping power to match.

About DCCD

DCCD lets the driver change the center differential’s lock from the cabin, which is useful on track, in snow or on gravel. However, a DCCD transmission needs a DCCD controller and wiring to work properly. These are not included unless shown in the photos. Therefore, plan to source a controller, or ask us about options for your build.

Why Version 8 Parts Fit the WRX

The JDM Version 8 STI used 5×100 hubs, the same bolt pattern as the 2002–2007 WRX. So, if you already run 5×100 wheels, you can keep them, as long as they clear the Brembo calipers. Also, because the package includes both subframes, the R180 rear end and the STI transmission cradle, the major mounting parts are already here.

Fitment

• 2002–2007 Subaru Impreza WRX (GD sedan), 5-speed to STI 6-speed conversion
• Wheels must clear the Brembo calipers; many 17-inch and larger wheels do
• Requires a DCCD controller and wiring for full DCCD function

Every swap is a little different, so send us your VIN and plans, and we’ll help you build a complete 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 kit matched to the 6MT flywheel, and resurface or replace the flywheel.
4. Bleed the brakes and check 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

Because this is a large, multi-piece package, we palletize it carefully and ship by freight anywhere in the continental US. Local customers can also pick it up at our Henrico shop, which we recommend for a package this size.

FAQ

What hubs are included?
Four-corner 5×100 hubs with Brembo calipers, which match the 2002–2007 WRX bolt pattern.

Is the DCCD controller included?
No, unless it’s shown in the photos. You’ll need a DCCD controller and wiring for full function.

Are both differentials limited-slip?
Yes. The front is a Suretrac helical LSD, and the rear is an R180 LSD.

Will my wheels fit?
They need to clear the Brembo calipers. Many 17-inch and larger wheels do.

Are the subframes included?
Yes, both front and rear.

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