034Motorsport Density Line Transmission Mounts BMW E9X M3
034Motorsport's Density Mounts are the new standard in comfort and performance. These mounts are redesigned with performance in mind and manufactured from high-durometer rubber for increased performance and durability without sacrificing comfort. Density Line Mounts are void-free and fluid-free, eliminating the slop associated with the factory mounts.
034Motorsport Density Line Transmission Mounts are manufactured from a 60 Durometer or 70 Durometer, void-free and fluid-free construction, which is a significant upgrade from the fluid-filled rubber used in stock BMW E9X M3 transmission mounts. The tail shaft of the transmission compresses and pulls up on the mounts, meaning the mount materials should be able to withstand both forces. In addition to these two forces, there are shear-twisting forces within the transmission mount assembly. Given that Polyurethane cannot withstand these forces reliably, it is not a long-term viable material for an upgrade in this location. Rubber is the ideal material for this transmission mount upgrade, as it can withstand stress under tension, compression, and shear.
The result is greatly reduced drivetrain slop and crisper shifting, with little to no increase in noise, vibration, or harshness (NVH) inside the cabin. The solid-rubber, void-free design eliminates the risk of collapse, a common issue with factory mounts. These mounts are a completely re-engineered performance solution, not just inserts for use with the factory mounts.
Which Durometer Should You Choose — 60 vs. 70?
| Feature | Street Density (60D) | Track Density (70D) |
|---|---|---|
| Best For | Daily & Spirited Driving | Aggressive Street & Track Driving |
| Drivetrain Control | Reduced slop vs. factory | Further reduced for max control |
| Shift Feel | Crisper, consistent | Most direct |
| NVH / Comfort | OE-like, next to no NVH change | Moderate vibrations & transmission whine audible |
Street Density Features:
- Manufactured from 60 Durometer Rubber with Void-Free Construction
- Reduced Drivetrain Slop
- Decreased Transmission Movement Under Load
- More Direct Power Transfer
- Improved Shifting Feel
- OE-like NVH
- Complete Drop-In Replacement for Factory Transmission Mounts
- Sold as a Pair
Track Density Features:
- Manufactured from 70 Durometer Rubber with Void-Free Construction
- Reduced Drivetrain Slop
- Decreased Transmission Movement Under Load
- More Direct Power Transfer
- Improved Shifting Feel
- Complete Drop-In Replacement for Factory Transmission Mounts
- Sold as a Pair
What's Included:
- (1x) Transmission Mount Pair
Part Number Interchange:
- 22 31 2 283 285
Fitment/Applications:
- BMW M3 2006-2013 E9X S65 4.0L
- BMW M5 2004-2010 E6x S85 5.0L
- BMW M6 2005-2011 E6x S85 5.0L