The MMX Dual Differential Mount (MMR55-1001) is a precision machined addition to the F8x M2, M3 and M4 differential, opening up a second rear mounting point BMW left completely unused from the factory. Run on its own in the OEM position, it adds a genuine second point of support to the diff, tightening up the connection to the chassis and reducing unwanted movement under normal and increased torque loads.
F8x diff mounts are a known weak point on this chassis, prone to tearing and premature failure under hard use. The Dual Differential Mount is a direct answer to that, adding real reinforcement rather than just stiffer rubber in the same single mounting point. It can be run with the factory bushes for a like-for-like fit, or with two of the MMX Rear Diff Mount Bush (MMR55-1603) for a firmer, more connected setup.
Paired with the MMX Front Differential Lift Mount / Cradle (MMR55-1604) and set to Lifted, the same mount raises the differential by 10mm. This corrects the driveshaft geometry that gets thrown out on lowered F8x builds, taking the heat and premature wear off the CV joints and axle shafts that comes with running a lowered ride height.
