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Differential and Gearing Upgrades

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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URO Speedometer Impulse Sender E24, E30, Z3, Z1

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:37993402

Part#: 62168355008

In Stock

$ 46.99 USD

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$ 46.99 USD

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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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Burger Motorsports Differential Support Bracket Brace - F-Chassis BMW...

T#:637547

Part#: BMS-DSBB-F

Back Ordered

Starting at $ 129.00 USD

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Starting at $ 129.00 USD

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The BMS differential brace attaches the rear differential to the subframe allowing better launches, less wheel hop, and a more stable feeling rear chassis. Their unique one-piece construction eliminates welding weak points common on similar units. No logos or markings are visible for a stealth OEM appearance.

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Active Autowerke Differential Support Bracket (DSB) - E36

T#:397248

Part#: 13-004

Ships in 10 Business Days

5% off MSRP $ 429.00

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

$ 408.00 USD

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5% off MSRP

$ 429.00

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

$ 408.00 USD

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The main mounting bolt for the differential in the E36 is susceptible to shearing off during extreme driving conditions. This can cause internal damage to your diff, leaving you stranded at the track or on the side of the road. Active Autowerke's differential support bracket eliminates this issue forever in under an hour installation.

Previously used Active Autowerke Part Number AA-DSB-E36

This product fits the following BMWs:
1992-1999 E36 323i 325i 328i M3

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URO Rear Differential Mount - BMW E24 E28

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:639176

Part#: 33171129784

In Stock

$ 37.41 USD

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$ 37.41 USD

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This mount connects to the rear differential cover and secures the rear differential to the subframe.

URO Differential Cover for E46 M3

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:37993429

Part#: 33112282482

In Stock

$ 241.99 USD

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$ 241.99 USD

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Differential bushing failure is a common weak point of the E46 M3. Bushings are not sold separately, you will need the whole rear cover.

BMS Differential Support Bracket Brace For G Chassis BMW/Supra ...

T#:49822560

Part#: BMSDSBBG

Ships on Aug 28, 2026

$ 229.00 USD

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$ 229.00 USD

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For G-Chassis BMW & A90/A91 Toyota Supra High torque loads, hard launches, and aggressive driving expose the factory differential mounting’s built-in compliance. Under power, the differential can shift excessively, resulting in wheel hop, inconsistent traction, and increased stress on drivetrain components—issues that become more pronounced on tuned or track-driven cars. The BMS Differential Support Bracket Brace corrects this weakness by reinforcing the differential mounting point and securely tying it to the subframe. By controlling unwanted movement, the brace improves rear-end stability and ensures power is transferred to the ground more efficiently. Why Upgrade? OEM differential mounts favor NVH reduction over control. As torque output increases, that compliance translates into drivetrain shock and lost traction. This brace stiffens the system where it matters most, reducing flex and improving load management under acceleration. Performance Benefits Improved launch consistency Significant reduction in wheel hop Increased rear-end stability under load More precise and predictable power delivery Engineered for Demanding Use Designed around factory mounting points, the BMS Differential Support Bracket delivers precise OE-level fitment with increased structural rigidity. Its robust construction resists deflection under high torque, while upgraded hardware provides greater clamping force for long-term reliability. Fully bolt-on for straightforward installation on both stock and modified vehicles. Key Features Reinforces rear differential mounting Limits differential movement under load Enhances traction and drivetrain response Heavy-duty construction for high-performance applications Bolt-on installation using factory locations Compatible with G-chassis BMW and A90/A91 Supra A focused drivetrain upgrade for drivers who demand consistency, control, and durability at higher performance levels.

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BMS Differential Support Bracket Brace - BMW 135i / E9x 335i - Large ...

T#:1316771

Part#: E9XDIFFBRACE-LG

Ships in 2 Business Days

$ 99.00 USD

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$ 99.00 USD

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Differential Bushing - Priced Each

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:641882

Part#: 33171134871

Ships in 2 Business Days

$ 27.99 USD

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$ 27.99 USD

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URO Speedometer Sensor

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:35863158

Part#: 62161369906

Ships in 2 Business Days

$ 70.99 USD

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$ 70.99 USD

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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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Rear Differential Bushing - Priced Each

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:385088

Part#: 33171090950

Ships in 2 Business Days

$ 50.99 USD

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$ 50.99 USD

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URO Differential Output Shaft Seal W/ Lock Ring - BMW E36 E46 E53 E60...

2X Entries For Our G87 M2 Sweepstakes!

T#:43750219

Part#: 33107505604

In Stock

$ 10.00 USD

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$ 10.00 USD

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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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Differential Input Shaft Seal - Priced Each

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

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Qty

$ 18.99

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

$ 15.99 USD

Limited Qty Sale

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Replaces cracked or hardened valve body seals

Rogue Engineering E46 M3 Differential Bushing (Front Position) FIX ...

T#:54388516

Part#: RE.484.FIX

Ships in 9 Business Days

$ 64.00 USD

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$ 64.00 USD

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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.

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