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OS Giken

OS Giken SuperLock LSD, BMW E30 M3

OS Giken SuperLock LSD, BMW E30 M3

Regular price $1,649.99 USD
Regular price Sale price $1,649.99 USD
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The OS Giken SuperLock LSD features their patented pressure ring design, delivering smooth, progressive locking. Distinguished by a spline-through-side-gear construction, OS Giken's design allows for the fitment of more friction plates (up to 2x as many as competing versions). 

Key Features:

  • All components undergo chemical heat treatment for maximum durability
  • Constructed from a high-grade steel alloy, ensuring exceptional strength
  • Gears are raw-forged for maximum strength
  • Clutch disks are precision-machined on both sides simultaneously to extremely tight tolerances, minimizing warpage
  • LSD case machined from a single billet piece for uniformity

The OS Giken SuperLock LSD allows for low preload while retaining a fully progressive 100% lock capability. This results in quiet operation, and the progressive locking mechanism ensures smooth and predictable engagement. Upgrading to an OS LSD when replacing an open diff will not only enhance the driving experience but also maintain everyday drivability.


  • BMW E30 M3
  • Designed for 188 mm - Found in E28, E30, E32, E34, E36 (12 mm Ring Gear Bolts)


  • Ramps - 25 / 38
  • Lock Timing - 336
  • Total Plates - 20
  • Preload - 10S

Installation Notes:

  • Refer to OEM Service Manual for install


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