Millway Motorsport Solid Alloy Rear Differential Bushes/Bushings for BMW E46 M3 (2000-2006) & Z4 M E85/E86 (2006-2008) – CNC Aluminium/Aluminum Final Drive Mount Kit, Hard Mount Diff Upgrade, Anti Wheel Hop/Driveline Clunk Fix, Direct-Fit Track/Drift Set

Millway Motorsport Solid Alloy Final Drive Mounting Bush Kit for BMW M3 E46 and Z4M E85 E86

Transform the rear end of your BMW with Millway Motorsport solid aluminium mounting bushes that lock the final drive to the subframe for instant response and rock‑steady traction. By replacing the soft factory rubber with precision CNC‑machined alloy, this kit removes unwanted movement in the driveline so you get cleaner launches, sharper throttle pickup and repeatable handling on fast road and circuit.

Performance benefits

• Hard mounts the differential to the rear subframe for consistent geometry under load
• Quicker torque transfer and crisper gear changes with reduced driveline slack
• Dramatically cuts axle tramp, hop and clunking on acceleration and over bumps
• Confidence‑inspiring rear axle stability through high‑speed corners and kerb strikes
• Ideal for track days, drift, time attack and serious fast road builds
• Engineered from solid aluminium for durability and heat resistance
• Direct replacement design with no trimming or welding required

Compatibility

• BMW M3 E46 2000 to 2006, S54, coupe and convertible
• BMW Z4M E85 roadster and E86 coupe 2006 to 2008

What is included

Complete car set of solid alloy bushes for the rear final drive mounts.

Why enthusiasts choose this kit

It is the go‑to solution for removing differential movement on E46 M3 and Z4M platforms. We have run these on our own builds and customer cars with outstanding results in traction, launch consistency and steering feel. Expect a tighter, more connected drive with power delivered straight to the tarmac.

Fitting and support

A press and appropriate drifts are recommended to remove the old rubber units and install these solid pieces. A four‑wheel alignment is sensible after work on the rear subframe. Professional installation is advised.

Prefer us to install it for you? MJ Modifications in Warwickshire offer expert fitting. Request a quote at info@mjmodifications.co.uk.

Good to know

Upgrading from rubber to solid aluminium can increase noise and vibration relative to stock. That trade‑off is normal for hard‑mounted performance setups and is worth it when chasing precision and durability.

Search terms customers use

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