BMW Motorsport Gear ratio swap set

This Gear ratio swap set is a must-have if you wish to change gear ratio of your BMW M3, M5, M6 or Z4M differential. It includes parts without which you can't complete a swap successfully.

• Adjustment shim set
• Pinion oil seal
• Large pinion bearing
• Crush sleeve shim
• Pinion position shim set (2.5 - 3.5mm)

If you are not sure how to change gear ratio properly, make sure you check this video out. 

Backlash adjustment shims OEM part numbers:

33139065736
33-13-9-065-736
33 13 9 065 736
33.13.9.065.736

33139065737
33-13-9-065-737
33 13 9 065 737
33.13.9.065.737

Or simply send us the last 7 digits of your VIN and we will confirm if they fit with your requirements as soon as possible.