RacingDiffs LSD Conversion Kit for Saab FM and F40 Gearboxes

Upgrade your Saab’s differential performance with the RacingDiffs LSD Conversion Kit, engineered specifically for FM and F40 gearboxes. This kit transforms your open differential into a 25% lock clutch-type limited slip differential (LSD), significantly improving traction and eliminating one-wheel spin. Designed for enthusiasts seeking enhanced control and drivability, the kit is a true plug & play solution, including all necessary components for straightforward installation.

Fitment Compatibility

• Variant 1 (FM Gearbox):
  • Saab 900 (1994-1998)
  • Saab 9000 (1985-1998)
  • Saab 9-3 (1998-2003)
  • Saab 9-5 (1998-2010)
• Variant 2 (F40 Gearbox):
  • Saab 9-3 (2003-2011, second generation)
  • Saab 9-5 (1999-2009, turbocharged models)

Key Features

• Converts stock differential to a 25% lock clutch-type LSD
• Plug & Play installation with all required hardware included
• Constructed from high-quality tool steel, heat-treated and nitrided for durability and wear resistance
• Integrated friction discs between plates and spider gears to prevent metal shavings—avoiding common issues found in lower-grade kits
• Utilizes ZF LSD technology with ramp angles for progressive locking under load: smooth for daily driving, increased lock as torque rises

Installation Note

Before installation, inspect the inner surfaces of the small spider gears for smoothness and integrity. If wear or damage is present, machining may be required to ensure proper fitment and longevity of the LSD conversion kit.