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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...

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

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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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Billet Diff Lock Down Kit

T#:21176906

Part#: VTT-A9X-DLD

In Stock

Sale - Save 7% $ 313.99

This product was last offered at the strikethrough price on
05-04-2026

Starting at $ 291.99 USD

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Sale - Save 7%

$ 313.99

This product was last offered at the strikethrough price on
05-04-2026

Starting at $ 291.99 USD

Add to Wish List

VTT noticed a hole in the A9X/Z4 market for a high-quality, lightweight, NVH-friendly, and easy-to-install Diff Lock Down kit to improve diff stability under launching, and hard cornering. Vargas went to work on a very innovative design that 100% positively locks the diff down from movement, while shielding it from adding a ton of NVH, and can be used with the stock diff, and subframe bushings. This design uses existing mounting points on the vehicle, you do NOT have to remove the subframe or the Diff to install. Simply remove 4 diff bolts, drill two holes in the subframe slightly bigger, install two M10 riv-nuts, and install the lockdown, you do not even have to move the exhaust. A typical install can be 15-30 minutes for someone who is experienced. You will need a Riv-nut tool to install the Riv-nuts as one is not included. Features: Lightweight 1.5 lbs for the entire lockdown plate Uses FOUR connection points on the Diff, and two on the subframe for the ultimate in positive diff location, this will stop all diff movement on launch, saving your guibos, etc 100% Billet construction from 6061-T6 aluminum Anodized in 4 colors for corrosion resistance, a long-lasting finish, and good looks The subframe does NOT have to be removed for installation Uses all 12.9 grade hardware Does not add excessive NVH Positively locks down the diff to eliminate all unwanted movement under launches, acceleration, cornering, etc.

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Powerflex BMW E21 Rear Diff Mounting Bushing

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

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Qty

Sale - Save 15%

$ 97.99

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

$ 83.29 USD

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:

Enhanced Stability: By minimizing differential movement, Powerflex bushings ensure consistent alignment, giving better rear-end stability.
Improved Longevity: Unlike rubber, polyurethane is resistant to aging and degradation from elements like oil and road debris.
Responsive Handling: With reduced play in the differential mount, power transfer becomes more direct, allowing for sharper throttle response.
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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AAF ZF Transmission Swap Kit - 5.5" Bearing - BMW E30

T#:52129730

Part#: E30ZFTSK55

Ships in 3 Business Days

$ 1,198.00 USD

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$ 1,198.00 USD

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Upgrade your E30’s drivetrain with the AAF ZF Transmission Swap Kit, a turnkey solution for those demanding more reliability and smoother gear engagement.

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Drivetrain Mounts and Upgrades

Sub-Categories

Powerflex Transfer Case Bushing Insert - Black Series (95A) - BMW E46...

Billet Diff Lock Down Kit

Powerflex BMW E21 Rear Diff Mounting Bushing

Key Benefits:

AAF ZF Transmission Swap Kit - 5.5" Bearing - BMW E30

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