Turner Dual-Mount Rear Differential Brace/Plate + ECS Tuning Poly Diff Bushings for BMW M2 M3 M4 F8X (F87 F80 F82 F83) - Final Drive/Diff Mount Support Upgrade, Wheel Hop & Axle Tramp Fix, S55 Driveline

BMW F8X rear diff upgrade for serious grip and response

Unlock the rear end of your F87 M2, F80 M3 or F82 F83 M4 with this dual mount diff support and polyurethane bush kit. BMW engineered the rear axle carrier to accept two rear final drive bushes, but the factory only fitted one. That single hydraulic bush is a common weak point on hard driven cars, leading to movement, axle tramp and a vague driveline feel. This upgrade utilises the unused mounting point to stabilise the final drive assembly, transforming traction and throttle response without turning your daily into a race car.

Why you want this on your F8X

• Dual rear mounting points for the final drive housing to control twist under load
• Reduces wheel hop and axle tramp on launches and fast corner exits
• Sharper throttle pickup, cleaner gear changes and less driveline shunt
• Improves power delivery to the tyres for track days, drag strip and fast road
• Street friendly NVH compared to solid or Delrin mounts

Premium construction

• Billet 6061-T6 aluminium support plate with black anodised finish for durability
• Performance polyurethane diff bushes in a tough 95A compound with CNC aluminium sleeves
• Engineered to handle high torque loads from the S55-powered F8X platform
• Complete bolt-on kit with hardware, fully reversible and no cutting required

Real-world results

We have fitted this setup on multiple customer cars and our own builds. Feedback is consistent: far better traction, crisper shifts and a calmer rear axle over bumps and hard launches. If you are chasing lap time, eliminating wheel hop, or simply want a tighter, more confidence-inspiring rear end, this is the diff mount upgrade that delivers.

Common symptoms this upgrade addresses

• Rear end squirm or hop under acceleration
• Vague or delayed response when getting back on the power
• Premature wear of the single OEM hydraulic bush

Compatibility and search terms

BMW M2 M3 M4 F87 F80 F82 F83. Also searched as: F8X diff brace, rear differential mount upgrade, dual mount diff plate, polyurethane diff bushes, final drive mount kit, axle tramp fix, wheel hop solution, BMW M3 diff carrier plate, M4 poly diff mounts, S55 driveline upgrade, rear subframe bush inserts.

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Email us for a fitting quote and lead time: info@mjmodifications.co.uk. We supply, install and road test for a complete, turn-key solution.

Note: If your factory rear bush shows cracking or fluid seepage, replace it without delay. This dual mount conversion helps prevent repeat failures by sharing the load across both rear positions.