Millway Motorsport Monoball Uniball RTAB Rear Trailing Arm Bearing/Bush/Bushing Kit for BMW E36 E46 Z4 E85/E86 (M3, Z4M) – Solid Spherical Toe Control Anti-Deflection RTAB Delete Upgrade Pair

Transform rear axle precision on your BMW E36, E46 and Z4 with this Millway Motorsport monoball rear trailing arm bearing conversion. By replacing the factory rubber compliance bush with a solid spherical bearing assembly, this kit removes unwanted movement at the RTA pivot for crisp handling, stable alignment and confident traction on fast road, track day and drift builds.

Engineered from high grade billet aluminium with motorsport spec spherical bearings, the housings and threaded locking rings deliver a secure, long lasting installation. The result is zero play, repeatable geometry and a planted rear end that inspires confidence under heavy braking, hard cornering and aggressive throttle application. Supplied as a matched pair for left and right sides.

Why enthusiasts choose this kit

• Monoball conversion eliminates bush squirm to control rear toe and camber
• CNC machined alloy bodies with premium bearings for durability
• Threaded lock rings and sleeves included for a precise fit
• Ideal for fast road, track day, sprint, time attack and drift use
• Direct swap for the OE rear trailing arm bush
• Priced per pair

Real world gains

• Sharper turn in and improved rear end stability
• Consistent alignment through suspension travel and load
• Reduced rear steer for predictable balance and exit traction
• More even tyre wear during spirited driving and circuit use

Compatibility

• BMW 3 Series E36 including M3
• BMW 3 Series E46 including M3
• BMW Z4 E85 and E86 including Z4M

What you receive

• 2 x Millway Motorsport monoball rear trailing arm bearing housings with spherical bearings
• Threaded locking rings and sleeves

Why buy from us

We run this setup on customer cars and our own builds. Feedback is consistent every time a more direct rear axle, cleaner feedback and the confidence to push harder. It is one of the most effective rear suspension upgrades for E36, E46 and E85 E86 platforms.

Fitting and support

Professional installation recommended. Book fitting with MJ Modifications in Warwickshire or request a tailored quote at info@mjmodifications.co.uk.

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