Universal Preload Measuring Tool for Limited Slip Differentials (LSD)

• Universal fit – mounts to any bolt-type output flange.
• 1/2" wrench compatible – works with standard socket wrenches and torque wrenches.
• Accurate measurement – ideal for LSD preload setup and breakaway torque checks.
• Workshop-ready construction – durable design for repeated use.

Breakaway torque is the minimum force required to rotate one output shaft while the opposite shaft is fixed.

It is one of the most important measurements when adjusting, rebuilding or fine-tuning a clutch-type limited slip differential. Correct breakaway torque helps ensure the LSD performs as intended on the street, track or in competition use.

• Precise adjustments – helps set the LSD for predictable locking performance.
• Better rebuild results – confirms preload after servicing clutch plates, shims or ramps.
• Essential for motorsport setups – especially useful for drivers who regularly tune their differential behavior.
• Easy integration – works with the standard tools already found in most workshops.

This measuring tool is especially useful for BMW E46 M3 and E9X M3 differential rebuilds, but its universal design makes it suitable for many other LSD units with bolt-type output flanges.

When used together with the GKN V2 LSD opening tool, it becomes part of a complete solution for rebuilding and adjusting BMW M differential units.

• Track day drivers
• Drift and motorsport enthusiasts
• Differential rebuild specialists
• DIY mechanics working on LSD setup
• Professional workshops

Every serious mechanic or track enthusiast should have a reliable method of measuring LSD preload. This tool helps ensure your differential is tuned correctly for maximum performance, durability and driving confidence.