Transfer Box Replacement & Service on a BMW 4 Series Gran Coupe
This BMW 4 Series Gran Coupe 3.0 was experiencing drivetrain issues — knocking noises and uneven power distribution caused by a faulty transfer box. We replaced the unit and carried out a complete service, restoring smooth operation with improved performance and reliability.
The Problem
The transfer box splits engine power between the front and rear axles on xDrive BMWs. When it fails, you feel knocking, binding in tight turns, and uneven power delivery. Diagnosis matters: similar symptoms can come from driveshafts or differentials, so we always check the full drivetrain first.
What We Completed
- ✓Diagnostic check of drivetrain system
- ✓Removal of faulty transfer box
- ✓Installation of replacement transfer box
- ✓Transfer box oil drained and refilled with correct fluid
- ✓System checked for leaks and proper operation
- ✓Final road test
The Result
Smooth and balanced power delivery restored, no more drivetrain noise or faults, and reliable, efficient driving ensured. Hearing knocking from underneath? Book our diagnostics service to trace it, and our mechanical team will complete the repair at your location.