This BMW E92 M3 2009 has undergone a ratio change from 3.85 to 3.62

A chap named Sam had is differential built by another company after complaining that the differential was noisy after the work had been carried out. The mechanic explained that he had done his best and couldn’t figure out what was wrong with the differential.  The differential at this point had been removed from the vehicle 3 times causing massive inconvenience to the client and mechanic. Lots of time and money wasted. The mechanic contacted us directly and we confirmed we could help! The Differential was sent in for a full inspection. We found that the gear ratio had been changed and not setup to the correct tolerances. After reworking the differential and setting the gearing up correctly, the client (Sam) is now extremely happy.