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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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Billet Diff Lock Down Kit
2X Entries Into Our F80 M3 Sweepstakes
Vargas Turbo Technologies - Corporate Logo
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
Free Shipping on orders $49 and up
Sale - Save 7%
$ 313.99

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

Starting at $ 291.99 USD
Free Shipping on orders $49 and up
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 Black Series - Corporate Logo
T#:6351046
Part#: PFF5-424BLK
Ships in 1 Business Day
$ 32.99 USD
Free Shipping
$ 32.99 USD
Free Shipping
Condor Speed Shop - Corporate Logo
T#:577943
Part#: E36HS
Ships in 6 Business Days
$ 18.99 USD
Free Shipping on orders $49 and up
Condor's Engine Mount Heat Sleeves reflect up to 90 percent of radiant heat. They withstand 1,100 degrees F of radiant heat and up to 450 degrees F of direct heat. The extra protection of the heat sleeves is a perfect fit for street cars, track cars, and other high heat applications. Their mounts withstand temperatures up to 180 degrees F and do not need any heat protection during regular usage, but we recommend the extra protection of their sleeves for all vehicles with high underhood heat temperatures such as turbo and supercharged vehicles. Condor heat sleeves can be easily installed by simply slipping the sleeve around the engine mount and securing using the Velcro tabs. *LISTING IS FOR ONE HEAT SHIELD **Heat sleeve fitment is for Condor Engine Mounts only.
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Powerflex - Corporate Logo
T#:53997745
Part#: PFF5-1526R
Ships in 1 Business Day
New Item
$ 41.99 USD
$ 41.99 USD
Stabilize your xDrive drivetrain with Powerflex. This 65A durometer polyurethane insert slides into your factory transfer case mount, eliminating high-torque deflection and optimizing power transfer under heavy loads.
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Powerflex - Corporate Logo
T#:54281644
Part#: PFR5-325H
Ships in 1 Business Day
New Item
$ 44.99 USD
$ 44.99 USD
The Powerflex Heritage Series is a premium motorsport upgrade engineered to eliminate critical differential deflection. Molded from an advanced, proprietary polyurethane formula, this bushing stabilizes the differential nose under high-torque loading.
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Condor Speed Shop - Corporate Logo
T#:577965
Part#: E30_M10M
Ships in 2 Business Days
$ 90.00 USD
Free Shipping
$ 90.00 USD
Free Shipping
These solid UHMW motor mounts are made specifically for M10 powered e30s. Under hard braking the stock mounts allow the M10 to lean forward. These solid UHMW replacement mounts stiffen the engine and drivetrain, dramatically changing the responsiveness of your 318. These solid UHMW motor mounts are a direct replacement for OEM rubber motor mounts. UHMW is an excellent general-purpose plastic with a unique combination of wear and corrosion resistance, low friction surface and impact strength. It is resistant to chemical attack and moisture absorption and retains key physical properties to -30 C.
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SuperPro - Corporate Logo
T#:6304577
Part#: SPF2501K
Ships in 3 Business Days
$ 35.99 USD
Free Shipping on orders $49 and up
$ 35.99 USD
Free Shipping on orders $49 and up
Powerflex - Corporate Logo
T#:53997743
Part#: PFF5-1526
Ships in 1 Business Day
New Item
$ 41.99 USD
$ 41.99 USD
Lock down your xDrive transfer case. This polyurethane mount insert slips into the factory rubber voids to eliminate drivetrain deflection, optimizing power delivery and stabilizing the driveline under hard load.
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Powerflex - Corporate Logo
T#:53997744
Part#: PFF5-1526P
Ships in 1 Business Day
New Item
$ 41.99 USD
$ 41.99 USD
Eliminate xDrive drivetrain twist. This 80A durometer polyurethane insert slides into the factory transfer case mount, locking down deflection for immediate throttle response and track-ready durability.
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SuperPro - Corporate Logo
T#:31655735
Part#: SPF2639K
Ships in 3 Business Days
$ 24.99 USD
Free Shipping on orders $49 and up
Powerflex - Corporate Logo
T#:15710802
Part#: PFR5-2025X2
Ships in 1 Business Day
$ 89.99 USD
Free Shipping on orders $49 and up
Poly bushings give a provide a more connected feel between you and your vehicle via a higher durometer than stock rubber bushings. Sometimes, this can be at the expense of NVH (noise, vibration, and harshness), but if you are driving your car on the track or just commuting in a spirited manner, poly may be a good option for you!
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Revshift - Corporate Logo
T#:1105941
Part#: PMM-M42-95A
Ships in 7 Business Days
$ 149.99 USD
Free Shipping on orders $49 and up
These mounts are designed for an E30 with a M42 engine and an E34 with a M50 or M20 engine. Revshift polyurethane motor mounts are made in the U.S.A. from high-grade polyurethane. Revshift mounts are the most durable and reliable mounts on the market. CNC machined billet aluminum flanged ends are embedded deep in the urethane which prevents the isolated ends from separating under extreme loads. Utilizing class 14.9 alloy steel removable screws these mounts will hold your engine in place for a lifetime. To further ensure the strength of these mounts we form the threads with a forming tap which creates denser and stronger threads in the billet aluminum end pieces. These mounts have removable screws for ease of installation. We recommend using Loctite on the threads during installation. Revshift Performance Engineering is a high-performance parts manufacturer with a focus on quality, reliability, and performance. Utilizing high-precision machining technologies and their very own Polyurethane Manufacturing Department, every Revshift product is designed, manufactured, and tested in-house at their Detroit, Michigan facility.
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Powerflex - Corporate Logo
T#:54352781
Part#: PFR5-1625H
Ships in 1 Business Day
New Item
$ 89.99 USD
$ 89.99 USD
Powerflex Black Series - Corporate Logo
T#:34382163
Part#: PFR5-1625BLK
Ships in 1 Business Day
$ 97.99 USD
Free Shipping on orders $49 and up

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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Powerflex - Corporate Logo
T#:54352762
Part#: PFR5-2025H
Ships in 1 Business Day
New Item
$ 89.99 USD
$ 89.99 USD
By stabilizing the differential's position relative to the subframe, the rear diff bushing helps maintain static axle angles under extreme loads, reducing wear on peripheral drivetrain components and providing a highly predictable, repeatable platform for track setups.
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Revshift - Corporate Logo
T#:1105949
Part#: PMM-M10-95A
Ships in 7 Business Days
$ 99.99 USD
Free Shipping on orders $49 and up
These mounts are designed for a 1983-1991 E30 BMW 3-series with an M10 engine. Revshift motor mounts are made by Revshift in the U.S.A. from high-quality polyurethane. Revshift mounts are the most durable and reliable mounts on the market. High tensile strength flanged studs are embedded deep in the urethane which prevents the isolated ends from separating under extreme loads. Utilizing class 12.9 alloy steel fasteners these mounts will hold your engine in place for a lifetime. The class 12.9 fasteners are approximately 75 percent stronger than the fasteners used on stock automotive mounts. Revshift Performance Engineering is a high-performance parts manufacturer with a focus on quality, reliability, and performance. Utilizing high-precision machining technologies and their very own Polyurethane Manufacturing Department, every Revshift product is designed, manufactured, and tested in-house at their Detroit, Michigan facility.
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Revshift - Corporate Logo
T#:27405446
Part#: PDB-F8X-70D
Ships in 7 Business Days
$ 249.99 USD
Free Shipping on orders $49 and up

Upgrade your vehicle's rear differential with the Revshift Polyurethane Rear Differential Bushing Set, delivering superior performance and stability. Engineered with precision and premium materials, this set is perfect for drift applications, offering enhanced handling and reduced drivetrain movement. This kit is ideal for any enthusiast looking to keep their drivetrain from moving when sliding.

Key Features:

Easy Installation: The two-piece design enables straightforward installation using the included Revshift bushing lube, making upgrading hassle-free. Drift Performance: Designed for drift track use with maximum stiffness polyurethane. Enhanced Stability: Minimize rear differential movement for improved stability and traction during acceleration, cornering, and braking. Durable Polyurethane Construction: Crafted from high-quality polyurethane, ensuring durability and long-lasting performance under daily driving conditions. Upgrade your vehicle's rear differential with the Revshift Polyurethane Rear Differential Bushing Set to experience a noticeable improvement in handling, stability, and overall driving dynamics. Elevate your drifting performance with confidence and precision.

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Advanced Auto Fabrication - Corporate Logo
T#:52129730
Part#: E30ZFTSK55
Ships in 3 Business Days
New Item
$ 1,198.00 USD
Free Shipping on orders $49 and up
Upgrade your E30’s drivetrain with the AAF ZF Transmission Swap Kit, a turnkey solution for those demanding more reliability and smoother gear engagement.

IRP - Individual Racing Parts - Corporate Logo
T#:587020
Part#: IRPDB-46MAL
Special Order: No Guaranteed ETA
$ 151.99 USD
Free Shipping
$ 151.99 USD
Free Shipping
These aluminum mounts are a direct replacement for the stock rubber bushings and have been lightened to remove excess weight. Using aluminum instead of rubber eliminates the "wind up" inherent in rubber mounts, and this deflection slows suspension & drivetrain response. The tradeoff is an increase in NVH. Features: Stiffens chassis/Improves stability Less wear of other components Better durability Provides better control of chassis geometry Replaces OE: 33172282484 Recommended for racing use only Includes: 2 rear aluminum bushing 1 front aluminum bushings
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Powerflex - Corporate Logo
T#:54352763
Part#: PFR5-2025BLK
Ships in 1 Business Day
New Item
$ 102.99 USD
$ 102.99 USD
The Powerflex Black Series is engineered for maximum performance and minimum deflection