Hard launches and quick shifts in an F80 M3, F82 M4 or F87 M2 twist the rear differential against its mounts, and that movement is what you feel as drivetrain slack. The MMX Performance F8X Dual Differential Mount adds a second rear mounting point to the differential, giving it more support and cutting that unwanted movement under load.
It is precision machined from 6061-T6 billet aluminum and installs with no permanent modification, with a minimal increase in NVH, so it suits street cars as well as track builds.
How the F8X Dual Differential Mount Works
Run it with the factory bushings at the OEM differential position, or pair it with two MMX rear differential polyurethane bushings (MMR55-1603) for a firmer connection. Add the MMX front differential cradle (MMR55-1604) and the differential can sit 10mm higher, which improves driveshaft and axle geometry on a lowered F8X and helps reduce heat and premature wear at the axle shafts.
For a full four-point setup, combine 1 x front differential cradle (MMR55-1604), 2 x rear differential polyurethane bushings (MMR55-1603) and this mount. Add the MMX F8X High-Capacity Baffled Differential Sump for extra oil capacity and cooling.
What's Included
- 1 x MMX F8X dual differential mount (MMR55-1001)
Key Features
- Precision-machined 6061-T6 billet aluminum
- Adds a second rear differential mounting point
- Increases differential support and reduces drivetrain movement under load
- Works with the factory bushings or two MMX polyurethane bushings (MMR55-1603)
- OEM differential position, or +10mm raised when paired with the MMX front cradle (MMR55-1604)
- Direct-fit installation with no permanent modification
- Minimal increase in NVH
- 1-year MMX warranty against defects in materials and workmanship
- Part number: MMR55-1001
Vehicle Fitment
Fits the following models:
- BMW F80 M3 Sedan (2015-2018)
- BMW F82 M4 Coupe (2015-2020)
- BMW F83 M4 Convertible (2015-2020)
- BMW F87 M2 (2016-2018)
- BMW F87 M2 Competition (2019-2021)
Installation Notes
Professional installation is recommended. The +10mm raised position requires the MMX front differential cradle (MMR55-1604), sold separately.
- Raise the car and support the rear differential.
- Fit the bushings you are using (factory or MMX MMR55-1603) into the dual differential mount.
- Install the mount at the rear differential using the secondary mounting point.
- Torque the hardware to BMW specification.
