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BMW Differential and Gearing Upgrades

Upgrading various parts of the differential can have tremendous benefits in your car's performance. It's easy to forget that the differential is a source for making your car faster and handle better so it's often overlooked. The engine is not the only place to make the car faster. Our differential options vary from gearing upgrades to limited slip conversions. You can purchase the ring & pinion gear sets on their own (professional installation required) or have us build a diff around your own specifcations. The options are almost endless! Every custom-built diff is fully rebuilt with seals and bearings. We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more!

Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). By using a shorter (numerically higher) final drive ratio you are increasing your RPM relative to road speed - this puts you in a more powerful RPM range than before! Since you're in a 'meatier' part of the power band you're now putting down more power/torque to the ground. If you can trade outright top speed for faster acceleration at daily speeds then this is the perfect upgrade for you.

Limited Slip Upgrades - Sadly, many BMWs today are not equipped with a limited slip (posi-traction) differential. BMW has tried to compensate by using traction control that cuts power at the engine or applies the brakes to retard wheel spin (or a combination of both). But nothing beats the function and feel of a a true LSD which may be why BMW continues to use them in M cars. Our LSD upgrades can be done a number of different ways - a factory-type limited slip unit with either 2 or 3 clutch packs, helical type, OS Giken unit, or something truly custom. We can also vary ramp angles and setup to change the limited-slip behavior under acceleration, deceleration, and cornering. Need a custom diff? Call or e-mail to have a quote.

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Whiteline - Corporate Logo
T#:26938502
Part#: KDT919
Ships in 4 Business Days
$ 96.99 USD
Free Shipping on orders $49 and up
After thorough development and material testing aimed at achieving strength, durability, geometry retention, and memory without compromising comfort, WHITELINE has introduced a progressive, long-chain Synthetic Elastomer. This groundbreaking material combines the advantages of solid bushings with the flexibility characteristics of rubber, striking an optimal balance between performance and comfort.
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Revshift - Corporate Logo
T#:27405455
Part#: PDB-F8X-80A
In Stock
$ 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 street applications, offering enhanced handling and reduced drivetrain movement without compromising on noise, vibration, or harshness levels. This kit is ideal for any enthusiast looking to improve vehicle dynamics without sacrificing overall comfort.

Key Features:

Easy Installation: Two-piece design enables straightforward installation using the included Revshift bushing lube, making upgrading hassle-free. Street Performance: Designed for street use, striking a balance between comfort and performance for everyday driving. 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. Reduced Noise and Vibration: Soft and pliable 80A durometer construction significantly reduces NVH compared to higher-durometer or solid alternatives. 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 street performance with confidence and precision.

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Revshift - Corporate Logo
T#:13957880
Part#: DBK-F8X
Ships in 6 Business Days
$ 599.99 USD
Free Shipping on orders $49 and up
Revshift polyurethane differential bushings completely replace the OEM rubber bushings on the BMW F8X M4 / M3 / M2. This kit includes a second rear bushing and a dual mount bracket that adds a mounting point to the subframe. These bushings securely mount the differential, eliminating wheel hop and improving the vehicle's handling capabilities. The two-piece bushing design sandwiches the subframe, locking everything in place. The bushings will not shift while driving, as other one-piece designs allow. The dual mount bracket was carefully designed for strength and a precise fit. This kit is entirely made at Revshift in the USA from our proprietary polyurethane formula and CNC-machined 6061-T6 billet aluminum.
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URO Speedometer Impulse Sender E24, E30, Z3, Z1
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:37993402
Part#: 62168355008
In Stock
$ 46.99 USD
Free Shipping on orders $49 and up
$ 46.99 USD
Free Shipping on orders $49 and up
This electronic sensor generates electrical pulses based on the final drive. These signals are then processed by the vehicle’s ECU or speedometer gauge to display real-time speed readings on the dashboard.
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Revshift - Corporate Logo
T#:39363088
Part#: DBS-E9X80A-REV
Ships in 3 Business Days
$ 129.99 USD
Free Shipping on orders $49 and up
Differential Bushing Set - BMW E9X / E8X (Non-M) Enhance your driveline performance with this premium differential bushing set, designed specifically for E9X and E8X Non-M models. Factory rubber bushings degrade over time, leading to excessive drivetrain movement, clunking, and inefficient power transfer. These high-quality replacement bushings provide firm, reliable differential support, minimizing deflection for sharper throttle response and improved drivetrain stability. Whether you're replacing worn-out components or upgrading for spirited driving, this set delivers a more connected and controlled feel on the road. Precision-engineered for a direct OE-style fit, these bushings install seamlessly without modifications. Restore crisp, precise performance to your BMW today! ✅ Direct-fit replacement for aging factory bushings ✅ Reduces drivetrain flex and enhances power delivery ✅ Perfect for daily drivers and performance applications 📦 Includes: Full set of differential bushings for a complete refresh.
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Revshift - Corporate Logo
T#:41728752
Part#: PDB-E46M-80A
Ships in 6 Business Days
$ 109.99 USD
Free Shipping on orders $49 and up
Revshift polyurethane differential bushings completely replace the OEM rubber bushings on the E46 M3 and Z4M. These bushings stiffen the differential, improving the vehicle's handling capabilities and eliminating drive-line slop.
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URO Differential Cover for E46 M3
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:37993429
Part#: 33112282482
In Stock
$ 241.99 USD
Free Shipping on orders $49 and up
Differential bushing failure is a common weak point of the E46 M3. Bushings are not sold separately, you will need the whole rear cover.
URO Rear Differential Mount - BMW E24 E28
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:639176
Part#: 33171129784
In Stock
$ 37.41 USD
Free Shipping on orders $49 and up
This mount connects to the rear differential cover and secures the rear differential to the subframe.

Shaft Seal
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Elring - Corporate Logo
T#:591509
Part#: 11117568263
In Stock
$ 22.99 USD
Free Shipping on orders $49 and up
Ideal for engine repairs or addressing leaks into the transmission bell housing, this shaft seal is designed to be mounted on the engine block's upper and lower halves, facing towards the transmission housing.
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Revshift - Corporate Logo
T#:1105908
Part#: PDB-E3095A
Ships in 3 Business Days
$ 49.99 USD
Free Shipping on orders $49 and up
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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Differential Bushing - Priced Each
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:641882
Part#: 33171134871
Ships in 1 Business Day
$ 27.99 USD
Free Shipping on orders $49 and up
Whiteline - Corporate Logo
T#:26671635
Part#: W92623
In Stock at Vendor
$ 32.99 USD
Free Shipping on orders $49 and up
The subframe serves as the mounting point for your rear suspension system. It connects to the body using bushings designed to absorb vibrations at all attachment points. These bushings play a crucial role in dampening vibrations that could otherwise be transmitted to the cabin, ensuring the subframe remains stable. Additionally, they provide a secure mounting surface, maintaining tightness throughout the assembly. If you notice excessive vibration inside your cabin or hear clunking or knocking sounds when driving over bumps, the issue may be related to your subframe bushings.
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URO Speedometer Sensor
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:35863158
Part#: 62161369906
Ships in 1 Business Day
$ 70.99 USD
Free Shipping on orders $49 and up
$ 70.99 USD
Free Shipping on orders $49 and up
BMW URO speedometer / pulse generator is mounted in the back of the differential and provides wheel speed information to the instrument cluster speedometer.

This item fits the following BMWs:
1984-1987 E30 BMW 318i 325e 325es 325i 325ic 325is
1982-1988 E28 BMW 524td 528e 533i 535i 535is M5
1983-6/1987 E24 BMW 633csi 635csi M6
1981-1987 E23 BMW 733i 735i
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Revshift - Corporate Logo
T#:1105928
Part#: DSS-12
Ships in 7 Business Days
$ 39.99 USD
Free Shipping on orders $49 and up
These studs and spacers mount the differential 12mm from the subframe. They are intended to be used with our 12mm offset subframe bushings. When raising the subframe, the spacers allow the differential to mount in the stock location which maintains proper pinion angle. The studs keep the spacers in place making for a quick and easy installation. The spacers are made from 6061 aluminum. The class 12.9 studs have hex key reliefs. We recommend using loctite during installation. Flange nuts are included. 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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Rear Differential Bushing - Priced Each
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:385088
Part#: 33171090950
Ships in 1 Business Day
$ 50.99 USD
Free Shipping on orders $49 and up

Revshift - Corporate Logo
T#:27405531
Part#: PDB-F8X-95A
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 track applications, offering enhanced handling and reduced drivetrain movement. This kit is ideal for any enthusiast looking to keep their drivetrain from moving during track use.

Key Features:

Easy Installation: Two-piece design enables straightforward installation using the included Revshift bushing lube, making upgrading hassle-free. Track Performance: Designed for race 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 racing performance with confidence and precision.

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URO - Corporate Logo
T#:43750219
Part#: 33107505604
In Stock
$ 10.00

This product was last offered at the strikethrough price on
08-12-2026

$ 9.98 USD
Free Shipping on orders $49 and up
$ 9.98 USD
Free Shipping on orders $49 and up
Maintaining a proper amount of fluid in the rear differential is vital to the performance and longevity of the differential. If a leaking shaft seal is left untouched, the results could be catastrophic. Two seals required per vehicle.
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URO - Corporate Logo
T#:49335120
Part#: 33121213949
In Stock
$ 18.99

This product was last offered at the strikethrough price on
07-27-2026

$ 15.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 18.99

This product was last offered at the strikethrough price on
07-27-2026

$ 15.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
Replaces cracked or hardened valve body seals

Elring Differential Axle Seal - E30 E36 E28 E34 E24 E23 E32 Z3 ...
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Elring - Corporate Logo
T#:369495
Part#: 33107505602
In Stock
$ 9.64 USD
Free Shipping on orders $49 and up

Rubber seals are often hardened and damaged by excessive heat and constant temperature changes causing them to become brittle and crack or split. If your seal has split, replace it with a new Elring seal for long reliability and to prevent further problems.

Elring is one of the biggest OEM names in the manufacturing of high quality gaskets that are available for very affordable prices. Elring has supplied many automotive names for years with the gaskets that seal your car's components from day 1 so you can rest assured that these components will last for a long time to come!

Fits the following BMW engines:
E30 318i/is 325e 325i/ix M3
E36 318i/ic/is/ti 323i/is 325i/is 328i/is M3
E28 524td 528e 533i 535i
E34 525i 530i 535i
E24 633CSi 635CSi
E23 733i 735i
E32 735i/iL
Z3 1.9 2.5 2.5i 2.8 3.0i M Coupe/Roadster

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Elring - Corporate Logo
T#:54852011
Part#: B16.900
In Stock
New Item
$ 33.99 USD
Free Shipping on orders $49 and up
This high-grade Elring replacement gasket set is engineered for drivers who demand factory-level reliability and zero-compromise sealing performance.


Rogue Engineering - Corporate Logo
T#:54388516
Part#: RE.484.FIX
Ships in 8 Business Days
New Item
$ 64.00 USD
Free Shipping on orders $49 and up
A common failure point on the BMW E46 M3 platform occurs when the side differential mounting bolt backs out, leading to stripped threads in the differential cover.
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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Genuine MINI - Corporate Logo
T#:31589336
Part#: 83192405829
Ships in 9 Business Days
8% off MSRP $ 36.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 33.99 USD
Free Shipping on orders $49 and up
8% off MSRP
$ 36.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 33.99 USD
Free Shipping on orders $49 and up


Elring - Corporate Logo
T#:44767282
Part#: 082.770
Special Order: No Guaranteed ETA
$ 24.99 USD
Free Shipping on orders $49 and up
$ 24.99 USD
Free Shipping on orders $49 and up
Eliminate differential leaks with all new output shaft axle seals from Elring Replaces BMW p/n 33107568368, 33107505605, & 33100152629
Elring - Corporate Logo
T#:44733256
Part#: 703.190
Special Order: No Guaranteed ETA
$ 34.99 USD
Free Shipping on orders $49 and up
If your differential is leaking fluid from the input shaft at the front of the diff case, there is a good chance this seal is faulty. Replace your leaking seal with this new seal from Elring to prevent further fluid loss and prevent damage to your differential. Replaces BMW p/n 33121213949, 33121212197, & 33121204847
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Elring - Corporate Logo
T#:54852004
Part#: B46.610
Special Order: No Guaranteed ETA
New Item
$ 14.99 USD
Free Shipping on orders $49 and up
This OEM-quality replacement shaft seal from Elring is the perfect fix for keeping your gear oil where it belongs.