Every G8x M2, M3 and M4 owner eventually runs into the same conversation, at some point, sooner or later, the differential moves more than it should. Under hard acceleration, under load, through every gear change, the factory mounting points were engineered for comfort, not control. There's more movement back there than most drivers realise, right up until they feel the diff shift and wonder what that clunk was.
That's before you even get to lowering. Drop the ride height, and the driveshafts run at an angle they were never designed for, accelerating wear on CV joints and axle shafts, and generating heat the factory setup was never built to manage.
MMX has solved both problems with one system, and as far as we know, nobody else on the market has. Meet the Front Differential Lift Mount / Cradle and the Rear Diff Raised Poly Bush, two parts, one system, built to stiffen the diff at stock height, or correct the geometry entirely on a lowered car.
Three Points: The Foundation
The MMX Front Differential Lift Mount / Cradle (MMR55-1604) tackles this from the front. On its own, fitted in the OEM position, it tightens up the connection between the differential and the chassis, cutting drivetrain movement under load without touching your geometry. Simple, effective, and the platform tightens up noticeably.
Add the MMX Rear Diff Raised Poly Bush (MMR55-1605) at the back, and the whole diff lifts by 10mm. Suddenly your lowered car has the driveshaft geometry it's supposed to have, heat and wear reduced, and the diff sitting exactly where it should for your ride height. Same cradle, same bush, just configured differently at the point of fitting. No separate lowered version to buy, no guessing which SKU applies to you.
This is the 3-point setup: one cradle, one bush, at OEM or Lifted, your call.
Four Points: Nowhere Left to Move
For those who want the differential properly locked down front, rear, top and bottom, the MMX Dual Differential Mount (MMR55-1606) joins the party, alongside a second Rear Diff Raised Poly Bush. This opens up a fourth mounting point BMW left completely unused from the factory, because apparently even German engineers leave a few stones unturned.
The result is a differential with nowhere left to move. Every point matched to the same height, OEM with OEM, Lifted with Lifted, nothing mixed, nothing compromised.
This is the 4-point setup: one cradle, one dual mount, two bushes, at OEM or Lifted throughout.
Modular by Design, Not by Accident
Here's the bit that actually matters: none of this is an all-or-nothing purchase. Run the cradle on its own. Add the bush when you're ready. Bring in the dual mount later if you want the full 4-point setup. And it doesn't stop at four points either, the MMX High Capacity Diff Sump and Drive Shaft Heat Shields both work alongside the system, for anyone who wants to take diff protection and cooling as far as it'll go.
Each part earns its place independently, and together they build into what is, without much competition, the most complete diff mounting system available for the G8x M2, M3 and M4.
Whether you're chasing a tighter platform at stock height or correcting geometry on a lowered build, the system scales to exactly what your car needs, and not a bolt more.
