ECS Tuning Polyurethane Transmission Mount Set - Street

BMW Gearbox Mount Upgrade for Sharper Shifts and Rock-Solid Drivetrain Control

Transform how your BMW drives with this performance polyurethane gearbox mount set. Engineered by ECS for fast-road use, this pair of poly mounts tightens up driveline movement, cleans up sloppy gear changes and helps you put power down with confidence. If you are fed up with vague shifting, missed changes or the drivetrain thumping on hard launches, this is the upgrade your car has been waiting for.

Why enthusiasts choose this poly mount kit

• Crisper gear engagement and improved shift precision under load
• Greatly reduces gearbox rock for a more connected, confidence-inspiring drive
• Polyurethane 70A street hardness balances comfort with control for daily-driven performance cars
• Oil, fuel and road grime resistant compound that keeps its shape over time
• Built-in safety lock feature to prevent separation on hard launches and high-torque setups
• High-grade polyurethane bonded to 304 stainless steel for durability

Unlike tired factory rubber pieces that compress and tear, these performance mountings limit deflection, reduce slop and protect surrounding components. Expect a noticeable uplift in shift feel and drivetrain stability. There may be a small increase in cabin vibration at idle, which most drivers find very acceptable for the benefits gained.

Street-spec 70A compound

The 70A street compound is the sweet spot for spirited road use and occasional track work. It reins in movement for cleaner shifts without being harsh. Ideal for tuned cars including turbocharged and supercharged builds that need stronger mountings without going full race.

Our experience

We have fitted these on customer cars and the feedback is exactly what you want to hear: firmer, more precise gear changes, better throttle-to-shift response and a more planted feel when driving hard.

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and expert advice.

What you get

• Pair of performance polyurethane gearbox mount assemblies
• Direct replacement for OE rubber items

Compatible BMW platforms and engines

This poly gearbox mount set covers a wide spread of classic and modern BMW models. Key applications include:

• 5 Series E34: 525i M20 M50, 530i M60, 535i M30, 540i M60, M5 S38
• 3 Series E36: 318i M42 M44, 320i M50, 323i M52, 325i M50, 328i M52, M3 S50 S52
• 5 Series E39: 525i M54, 528i M52, 530i M54, 540i M62, M5 S62
• 3 Series E46: 323i 325i 328i 330i M52 M54, M3 S54
• 1 Series E82 E88: 128i N52, 135i N54 N55, 1M N54
• 3 Series E90 E91 E92 E93: 325i 328i 330i N52, 335i N54 N55
• 2 Series F22 F23: 228i N20, 230i B46, M235i N55, M240i B58
• 3 Series F30: 320i N20, 328i N20, 328d N47, 330i B48, 335i N55, 340i B58, ActiveHybrid 3
• 4 Series F32 F33 F36: 428i N20, 430i B46, 435i N55, 440i B58
• M3 M4 F80 F82 F83: S55
• Z3: 1.9 M44, 2.3 2.5 2.8 M52, 2.5i 3.0i M54, M Roadster and M Coupe S52 S54

Ideal search terms for this upgrade

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