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E46 M3 Differential Mounts and Upgrades

E46 M3 Differential Mounts and Upgrades Rubber mounts are used to locate the differential to the subframe in RWD BMWs. This is one area that we like to focus on to improve power transfer, response time, and the overall feel of the drivetrain. By using a stiffer bushing you reduce or eliminate the 'wind up' and deflection of the stock rubber differential mounts when power is applied. A solid bushing will not twist when power (torque) is applied. Instead that power is directed to the drive wheels where it will do the most good. Our diff mount upgrades are solid rubber, Delrin, or aluminum kits depending on the application and the intended use. Even though these were developed for our race cars, we put them in a lot of street cars as well. The diff is not directly linked to the wheel and suspension so these are not as affected by bumps and road imperfections. Some additional drivetrain vibration may be felt through the chassis but in our experience it's very minimal. When installing one of our performance differentials make sure you also replace the mounts! And any subframe overhaul should also include solid diff mounts. There's no downside!
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IRP Performance Solid Engine and Transmission Mounts - E30 E36 E46

Stock mounts are made from soft rubber and are sometimes filled with fluid to give a car the most comfortable ride possible. The soft rubber and fluid helps to reduce the total amount of vibration, noise, and harshness (NVH) that is transferred into the cabin. The problem with this is driveline slop. The stock mounts allow a lot of excess movement and increases the amount of time it takes to transfer power to the wheels.

In order to address this issue, performance mounts can be substituted to reduce the amount of slop and transfer power to the wheel quicker. Two options for this are polyurethane mounts and solid mounts. 

The middle ground is Polyurethane. Polyurethane is much stiffer than rubber, but these still let a large amount of movement in comparison to solid mounts. These are great for sporty, aggressive street driving, but for the track are not ideal.

For the track, solid mounts are great. Solid mounts give you an immediate transfer of power, at the cost of increase NVH. This is great for the track where comfort is the least of your worries and power is all that is important.

Features:

  • Aluminum and Polyurethane Construction
  • 80A Durometer Rating
  • New Hardware
IRP - Individual Racing Parts
Part #: IRPEGS-1
Price: $182.95 (USD) 
Ships on Jun 27, 2018
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Front Differential Mount Bushing - OEM Rubber - E46 M3, Z4 M When working on the rear subframe, replacement of any rubber bushings and mounts should be performed. This is the front differential mount bushing and it takes the majority of the torquing motion of the diff when under load. The constant twisting will cause this bushing to wear out pretty fast. This is the Original BMW rubber part.

Applications:
2001-2006 E46 M3, M3 CSL coupe and convertible
2007-up Z4 M Roadster, M Coupe

Genuine BMW
Part #: 33172282484
Price: $28.95 (USD) 
$40.11 (28% off MSRP)
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E46 M3, Z4M Performance Polyurethane Differential Bushing Set

Worn rubber differential mounts will lead to the differential twisting and shifting around in the rear subframe. Not only will this be noisy but it's bad for driver confidence and bad for the chassis as well. Even on fresh rubber bushings the differential has deflection and twist, especially if the car has been modified for more torque. Since the differential is centrally mounted in the rear subframe, with all suspension mounts interconnected, a differential with too much deflection will affect handling and could even damage the rear subframe.

These 88A urethane E46 M3 diff mounts are much stiffer than stock but still not as solid as our Turner aluminum/Delrin bushings. This set will resist twisting much better than the stock rubber mounts. Included is the front diff mount and two rear mounts in the cover.

ECS
Part #: 002447ECS03KT
Price: $111.95 (USD) 
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IRP Performance Polyurethane Engine and Transmission Mounts - E36 E46

Stock mounts are made from soft rubber and are sometimes filled with fluid to give a car the most comfortable ride possible. The soft rubber and fluid helps to reduce the total amount of vibration, noise, and harshness (NVH) that is transferred into the cabin. The problem with this is driveline slop. The stock mounts allow a lot of excess movement and increases the amount of time it takes to transfer power to the wheels.

In order to address this issue, performance mounts can be substituted to reduce the amount of slop and transfer power to the wheel quicker. Two options for this are polyurethane mounts and solid mounts.

Solid mounts are great for an immediate transfer of power but allow for a ton of noise and vibration to be felt and heard in the cabin of the vehicle. This is great for the track where there aren't any issues with excess harshness, but as a daily driver, this can become an annoying pain in the neck.

The best middle ground is Polyurethane. Polyurethane is much stiffer than rubber and gives you the much stiffer feel you may be looking for. This allows for the increase in responsiveness, but isn't so extreme that it transfers all of the sound and vibrations into the cabin. This makes it much more comfortable for daily use while still reinforcing your driveline.

Features:

  • Aluminum and Polyurethane Construction
  • 80A Durometer Rating
  • New Hardware
IRP - Individual Racing Parts
Part #: IRPEGS-2
Price: $199.95 (USD) 
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Rear Differential Mounts - Turner Solid Aluminum - E46 M3 Made in the USA For our Grand-Am Cup E46 M3s we wanted a fully solid differential mount setup. The advantages of a fully-solid aluminum set is that they last forever, quickens response in the suspension, and frees up horsepower to the wheels. These fully solid aluminum diff mounts are CNC machined and lightened for a direct replacement of the original rubber pieces.

By substituting aluminum for rubber we can take out all of the deflection and 'wind up' inherent to the original rubber pieces. The high deflection rate of the stock rubber means the suspension reacts slower as the bushing is compressed. The power used to compress that bushing is instead passed straight to the axles and wheels. And since there is no time lost to deflection, response is greatly improved. These diff mounts are only recommended for racecars since the aluminum transfers more noise and vibration.

This is a 3-piece set with a single front bushing and two rear bushings to press into the cover. They mount with the stock BMW hardware.

This item fits the following BMWs:
2001-2006 E46 BMW M3
Turner Motorsport
Part #: TDR4680035
Price: $134.95 (USD) 
$149.95 (Sale - Save 10%)
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E46 M3 Stock Differential Cover With Bushings BMW does not sell the differential mounts separate from the cover. And as with all rubber mounts, they will have to be replaced at some point, forcing you to also buy a new diff cover. This is an Original BMW part.
**Note** - a paper gasket is not sold with this cover. BMW no longer uses paper gaskets - they advise the use of a silicone sealant such as RTV black.

Applications:
2001-2006 E46 M3, M3 CSL, coupe and convertible

Genuine BMW
Part #: 33112282482
Price: $178.98 (USD) 
$219.95 (19% off MSRP)
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