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Drivetrain Mounts and Upgrades

From the factory, engine and transmission mounts are rubber and thus a wear component. Worn out engine or transmission mounts create sloppiness and a disconnect between the driver and your BMW's powerplant. If your vehicle is purpose built for the track, we recommend solid engine and transmission mounts. These have zero deflection, but come at the expense of added NVH (noise, vibration, and harshness). Poly engine and transmission mounts offer a good balance between OEM rubber and solid mounts for those with mixed purpose vehicles, offering great performance and connection with little sacrifice in terms of NVH.

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Powerflex Transfer Case Bushing Insert - Black Series (95A) - BMW E46 E9X E60 F01/02 E84 E83 xDrive
Powerflex Transfer Case Bushing Insert - Black Series (95A) - BMW E46...
Powerflex Black Series - Corporate Logo
T#:28104806
Part#: PFF5-4628BLK
Ships in 1 Business Day
Sale - Save 15% $ 49.99

This product was last offered at the strikethrough price on
08-14-2026

$ 42.49 USD
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Sale - Save 15%
$ 49.99

This product was last offered at the strikethrough price on
08-14-2026

$ 42.49 USD
Free Shipping on orders $49 and up
Add to Wish List
Powerflex's new transfer case bushing insert is made from polyurethane and is designed to reinforce your OE rubber transfer case bushing. This helps to stiffen the bushing and limits excessive movement of the transfer case. This Black Series bushing is rated at 95A durometer, which is significantly stiffer than your OE bushing's rubber. This is perfect for someone who tracks their BMW regularly and is looking for the best performance possible without going for a solid mount solution. As this bushing is 95A durometer, a significant amount of extra NVH should be expected.
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Powerflex BMW E21 Rear Diff Mounting Bushing
Powerflex BMW E21 Rear Diff Mounting Bushing
Powerflex Black Series - Corporate Logo
T#:34382163
Part#: PFR5-1625BLK
Ships in 1 Business Day
Sale - Save 15% $ 97.99

This product was last offered at the strikethrough price on
08-14-2026

$ 83.29 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 15%
$ 97.99

This product was last offered at the strikethrough price on
08-14-2026

$ 83.29 USD
Free Shipping on orders $49 and up
Add to Wish List

The Powerflex Rear Diff Mount Bushing for the BMW E21 offers a robust solution to support and stabilize the differential, replacing the standard rubber bushings with durable polyurethane. This upgrade minimizes unwanted differential movement, enhancing driving dynamics and responsiveness.

Key Benefits:

  1. Enhanced Stability: By minimizing differential movement, Powerflex bushings ensure consistent alignment, giving better rear-end stability.
  2. Improved Longevity: Unlike rubber, polyurethane is resistant to aging and degradation from elements like oil and road debris.
  3. Responsive Handling: With reduced play in the differential mount, power transfer becomes more direct, allowing for sharper throttle response.
  4. Vibration Dampening Options: Powerflex offers options like the Black Series for motorsport applications and the standard Purple for everyday performance with minimal increase in vibration.

These bushings are popular among E21 owners who want a durable, performance-oriented solution that balances comfort and handling precision. Ideal for both spirited driving and daily use.

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