From the factory, the rear differential in a G80 M3, G82 M4 or G87 M2 hangs on rubber mounts and a single rear bushing. Put more power or sticky tires through it and that differential moves, which shows up as slack on and off the throttle and, over time, seeping differential and CV seals. The MMX Performance 4-Point Differential Lift Kit locates the differential at four points instead of three, so it stays planted under load.
The fourth point is the key. MMX's dual differential mount uses a secondary bushing location BMW leaves empty, giving the differential a new rear support structure. The whole system installs at factory height or raised +10mm, so it works on a stock-height car and corrects driveshaft geometry on a lowered one.
How the 4-Point Differential Lift Kit Works
The MMX front differential cradle (MMR55-1604) replaces the factory front mount and is machined from 6061-T6 billet aluminum. The MMX G8X dual differential mount (MMR55-1606), also CNC machined from 6061-T6 billet, adds the new rear support and comes with its mounting hardware. Two MMX raised rear differential bushes (MMR55-1605) in 80A durometer polyurethane complete the four mounting points, each with a two-position center for factory height or +10mm.
Controlling differential movement also helps prevent the differential and CV seal weeping that excessive movement causes. If you are starting smaller, the MMX 3-Point Differential Lift Kit uses the cradle and one bush. For track cars, the MMX Ultimate Track Differential Kit adds a high-capacity baffled sump and output shaft heat shields to this system.
What's Included
- 1 x MMX front differential lift mount / cradle (MMR55-1604)
- 1 x MMX G8X dual differential mount (MMR55-1606) with mounting hardware
- 2 x MMX rear differential raised poly bush (MMR55-1605), one for the factory rear mount and one for the dual mount
Key Features
- Four-point differential mounting: front cradle, dual differential mount and two rear bushes
- Dual mount uses the factory secondary bush location left empty from the factory
- Front cradle and dual mount machined from 6061-T6 billet aluminum
- 80A durometer polyurethane rear bushes
- Installs at factory differential height or raised +10mm
- Raised position corrects driveshaft geometry on lowered cars
- Direct fit with no modification required
- Fits RWD and xDrive models
- Part number: MMR55-0002
Vehicle Fitment
Fits the following S58-powered models, RWD and xDrive:
- BMW G80 M3 Sedan (2021-2026)
- BMW G82 M4 Coupe (2021-2026)
- BMW G83 M4 Convertible (2022-2026)
- BMW G87 M2 (2023-2026)
- BMW G81 M3 Touring (2023-2026, not sold in the US)
Installation Notes
Professional installation is recommended. The differential has to be supported while the factory mounts come out, and the cradle and both rear bushes must be set to the same height position.
- Raise the car and support the rear differential.
- Remove the factory front differential mount and rear differential bush.
- Choose factory height or +10mm and set the cradle and both rear bushes to the same position.
- Install the cradle, dual differential mount and bushes in their mounting locations and torque the hardware to BMW specification.
