RD6012
For WRX STI drivers who want to eliminate slip and maximize traction, the RacingDiffs R180 Block Disc Set converts the OEM clutch-type LSD into a permanently locked differential. You get the instant power transfer of a welded diff—without the cracking risk and with reversible installation.
If you prefer to retain LSD functionality with higher torque capacity, see our WRX STI R180 LSD Clutch Plate Upgrade Kit.
Note: Carrier bearings, oil seals, and shims are not included—reuse if in good condition or replace as needed.
| Diff type | Subaru R180 rear differential (WRX STI; DCCD center system unaffected). |
|---|---|
| Function | Replaces clutch packs to force permanent lock (100% coupling) at the rear axle. |
| Setup notes | Inspect carrier bearings & races; set preload/backlash per OEM spec after reassembly; verify gear contact pattern. |
| Fluids | Use a high-quality gear oil appropriate for locked differentials; change after initial heat cycle. |
| Road use | Intended for motorsport / off-highway use; low-speed tire scrub and increased NVH are normal with 100% lock. |
Subaru WRX STI models equipped with the R180 rear differential (various years/markets). If unsure, send us your VIN and we’ll confirm compatibility.
For serious drifters and drag racers who demand total lock, this is the ultimate Subaru R180 differential upgrade.