RD6009
For Mustang drivers pushing limits in drifting and drag racing, a fully locked rear diff is key to consistent launches and exit grip. The OEM Traction-Lok clutch-type LSD is tuned for street comfort and allows slip. The RacingDiffs Block Disc Set replaces the clutch packs to create a permanently locked differential—delivering welded-diff traction without the cracking risk and with reversible installation.
Prefer to retain LSD operation with higher torque capacity? See our Mustang LSD Clutch Plate Upgrade Kit.
| Diff family | Ford 8.8" Traction-Lok, 28-spline axle version (street-tuned LSD). |
|---|---|
| Function | Replaces clutch stacks to force permanent 100% lock at the axle. |
| Setup notes | Inspect carrier/side bearings; re-set backlash and verify tooth contact pattern after assembly; torque ring-gear bolts with medium threadlocker in a star pattern. |
| Fluids | Use a high-quality gear oil suitable for fully locked diffs; change after initial heat cycle. |
| Street NVH | 100% lock increases low-speed tire scrub and NVH; intended primarily for motorsport/off-highway use. |
Important: This kit targets 28-spline Traction-Lok carriers. It does not fit 31-spline units. Confirm spline count before ordering.
Carrier bearings, seals, and shims are not included—replace if worn.
Ford Mustang models equipped with the 8.8" 28-spline Traction-Lok rear differential (varies by year/trim). If unsure, send us your VIN or axle code to confirm.
Need full traction without compromise? This is the ultimate Mustang Traction-Lok upgrade for drift and drag applications.