How a car works

All partsBMW M4 CSLDrivetrainActive M differential › Spider gears

Spider gears

Part of Active M differential · about $340 to replace

What it is

Two spider and two side gears in the carrier.

What it does

Let the rear wheels turn at different speeds in corners.

How it fails

Wear from repeated one-wheel spin.

MaterialForged steel
Spec4 gears
Spider gears highlighted on the car

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