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All partsBMW M4 CSLDrivetrain › Torque converter

Torque converter

Part of Drivetrain · about $1,400 to replace

What it is

Lock-up torque converter with damper.

What it does

Multiplies torque at launch, then locks for a solid connection.

How it fails

Shudder under light throttle at 1,500 rpm is the lock-up clutch.

MaterialStamped steel shell, friction lock-up clutch
SpecStall 2,400 rpm
lock-up from 2nd gear
Torque converter highlighted on the car

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