OS Giken SuperLock LSD, BMW E39 M5

OS Giken SuperLock LSD for BMW E39 M5 – Track-Ready Limited Slip Differential with Street Comfort

Upgrade the rear differential of your BMW E39 M5 with the OS Giken SuperLock LSD—designed for smooth, progressive engagement and uncompromising traction. This performance differential features OS Giken’s exclusive pressure ring technology and a spline-through-side-gear construction that accommodates up to twice as many friction plates as conventional LSDs.

Whether you're daily driving, canyon carving, or tracking your M5, this limited slip differential provides quiet operation at low loads and a true 100% locking capability under hard acceleration—delivering better power transfer, sharper handling, and improved stability.

Key Features:

• Patented pressure ring system for smooth, consistent locking

• Spline-through-side-gear design supports high friction plate count (20 total)

• Low preload setting maintains quiet operation and comfort

• Chemically heat-treated components for superior durability

• High-grade forged steel construction for maximum strength

• Billet-machined LSD case for precision fitment

• Dual-surface precision clutch discs resist warping under extreme loads

This LSD is a direct-fit upgrade for the E39 M5 and ideal for those looking to replace a worn factory LSD or improve upon the stock open differential for serious performance gains without compromising street drivability.

Specifications:

• Ramp Angles: 25 / 35
• Lock Timing: 336
• Total Friction Plates: 20
• Preload: 10S

Vehicle Compatibility:

• BMW E39 M5

Installation Notes:
Installation should be performed by a qualified professional. Refer to the OEM BMW service manual for proper procedure and torque specs.