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  • Ford Mustang 8.8" LSD Block Disc Set – 100% Lock for Drifting & Drag Racing

    RD6009

    Ford Mustang 8.8" — 28-Spline

    Traction-Lok Block Disc Set (100% Lock)

    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.

    Why Choose the Block Disc Set
    • 100% lock, no delay: Both wheels receive equal torque at all times—no LSD slip.
    • Drift & drag ready: Instant power transfer for hard launches and stable, predictable angles.
    • Stronger than welding: No carrier distortion or cracked spider gears; designed for longevity.
    • Reversible install: Remove the block discs to restore clutch-type LSD if desired.
    • Maintenance-free: No special oils or service beyond routine differential checks.
    Technical Specs / Installation Tips
    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.

    What’s in the Box
    • Block Disc Set for Ford 8.8" 28-spline Traction-Lok (replaces OEM clutch plates).
    • Installation guide with best practices and torque notes.

    Carrier bearings, seals, and shims are not included—replace if worn.

    Fitment

    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.