OS Giken SuperLock LSD, BMW E28

OS Giken SuperLock LSD for BMW E28 535i / M535i / M5 – Limited Slip Differential Upgrade

Upgrade your classic BMW E28 with the OS Giken SuperLock LSD—engineered for enhanced traction, cornering stability, and smooth power delivery. Designed specifically for the E28 535i, M535i, and M5, this performance limited slip differential is ideal for street driving, track days, or spirited canyon runs.

OS Giken’s patented pressure ring system and spline-through-side-gear construction allow for up to twice as many friction plates as conventional LSDs. The result is a progressive and quiet differential that engages smoothly yet offers a full 100% locking capability under heavy throttle.

Key Benefits:

• Patented pressure ring design delivers smooth, progressive lockup

• Spline-through-gear design allows more friction plates for superior control

• Operates with low preload while maintaining 100% locking under load

• Chemical heat-treated components for long-term durability

• Constructed from high-grade forged steel

• Dual-sided precision-machined clutch discs for minimal warpage and consistent contact

• Billet-machined LSD case ensures structural integrity and precise fitment

Whether you're replacing an open differential or restoring the limited-slip performance of your factory unit, the OS Giken SuperLock LSD delivers predictable handling without sacrificing daily drivability.

Technical Specifications:

• Ramp Angles: 25 / 35

• Lock Timing: 336

• Total Friction Plates: 20

• Preload: 10S

Vehicle Fitment:

• BMW E28 535i
• BMW E28 M535i
• BMW E28 M5

Installation Notes:
Please refer to the factory BMW service manual. Professional installation is highly recommended for optimal results.