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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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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.

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.

Shaft Seal

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

T#:591509

Part#: 11117568263

In Stock

$ 22.99 USD

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$ 22.99 USD

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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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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 1 Business Day

$ 27.99 USD

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$ 27.99 USD

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Genuine BMW M Performance Limited Slip 2.81 Differential - F22/23 F3X...

T#:402424

Part#: 33108659989

In Stock

2% off MSRP $ 3,370.00

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

$ 3,310.99 USD

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2% off MSRP

$ 3,370.00

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

$ 3,310.99 USD

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Ensure your getting all the power you can to the road with this LSD from BMW Performance

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 1 Business Day

$ 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 1 Business Day

$ 50.99 USD

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$ 50.99 USD

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Genuine BMW M Performance BMW M Performance Limited-Slip Differential...

T#:222981

Part#: 33108659987

Ships in 1-2 days

8% off MSRP $ 3,370.00

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

$ 3,100.35 USD

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Qty

8% off MSRP

$ 3,370.00

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

$ 3,100.35 USD

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For the ultimate in track day performance, the M Performance Limited Slip Differential is here! The clutch-type mechanical differential features a 30% lockup on acceleration and 9% lockup on deceleration. The differential works with the existing DSC system to provide excellent traction wet or dry. It uses the stock 3.08 final drive ratio that the stock M235i uses, so fuel economy will not be affected. This item fits the following BMWs:
2014+ F22 BMW 228i M235i

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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

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

$ 9.98 USD

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$ 9.98 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

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!

T#:369495

Part#: 33107505602

In Stock

$ 9.64 USD

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$ 9.64 USD

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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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Seal Set, Electric Motor

T#:54852011

Part#: B16.900

In Stock

$ 33.99 USD

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$ 33.99 USD

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This high-grade Elring replacement gasket set is engineered for drivers who demand factory-level reliability and zero-compromise sealing performance.

OEM Elring Rear Differential Axle Shaft Seal - BMW F3X G2X G8X & More...

T#:53008820

Part#: 33108860348

Ships in 1 Business Day

$ 44.99

This product was last offered at the strikethrough price on
05-08-2026

$ 43.99 USD

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Qty

$ 43.99 USD

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The Axle Shaft Seal is a critical component designed to prevent fluid leaks around the axle shaft, ensuring the proper function of the vehicle’s drivetrain system. This seal helps maintain the integrity of the differential, preventing dirt, water, or contaminants from entering the diff while keeping lubricants contained.

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Elring Differential Output Shaft Seal - BMW E82 E9X Z4 E39 E60 E63/64...

T#:44767282

Part#: 082.770

Special Order: No Guaranteed ETA

$ 24.99 USD

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$ 24.99 USD

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Eliminate differential leaks with all new output shaft axle seals from Elring Replaces BMW p/n 33107568368, 33107505605, & 33100152629

Elring Differential Input Shaft Seal - 50x80x9mm - BMW E82 1M, E46 M3...

T#:44733256

Part#: 703.190

Special Order: No Guaranteed ETA

$ 34.99 USD

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$ 34.99 USD

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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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Shaft Seal - Differential (Axle Drive)

T#:54852004

Part#: B46.610

Special Order: No Guaranteed ETA

$ 14.99 USD

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$ 14.99 USD

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This OEM-quality replacement shaft seal from Elring is the perfect fix for keeping your gear oil where it belongs.

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