All parts › BMW M4 CSL › Drivetrain › Active M differential › Ring gear
Ring gear
Part of Active M differential · about $780 to replace
What it is
Hypoid crown wheel.
What it does
Turns the drive 90° and provides the final reduction.
How it fails
Pitting after oil starvation.
| Material | Case-hardened 20MnCr5 |
|---|---|
| Spec | 3.15:1 |
| 210 mm |
