Skip to product information
1 of 1

OS Giken

OS Giken SuperLock LSD, BMW E46 318i

OS Giken SuperLock LSD, BMW E46 318i

Regular price $1,549.99 USD
Regular price Sale price $1,549.99 USD
Sale Sold out
Shipping calculated at checkout.

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 E46 318i 


  • Ramps - 25 / 38
  • Lock Timing - 336
  • Total Plates - 12
  • Preload - 6S

Installation Notes:

  • Refer to OEM Service Manual for install


View full details