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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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Victor Reinz Differential Rear Axle Shaft Seal with Lock Ring - E46 M...

T#:7917

Part#: 33107510289

Ships in 2 Business Days

$ 25.44 USD

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$ 25.44 USD

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Leaking differential output seals? Replace yours today with this OEM replacement. This seal measures 76x50x10.

Front Differential Bushing - Priced Each

We Price Match - Give Us A Call or Chat!

T#:362591

Part#: 33171090389

In Stock

$ 28.99

This product was last offered at the strikethrough price on
05-07-2026

$ 23.99 USD

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$ 23.99 USD

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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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OEM BMW Rear Differential Mount - E46, E83 X3, E85 Z4

We Price Match - Give Us A Call or Chat!

T#:12525

Part#: 33176751808

In Stock

$ 44.99

This product was last offered at the strikethrough price on
04-18-2026

$ 27.99 USD

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$ 27.99 USD

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RUBBER MOUNTING REAR:331020

Rear Differential Mount - Front Position

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T#:594515

Part#: 33316792873

Ships in 2 Business Days

$ 41.99

This product was last offered at the strikethrough price on
05-07-2026

$ 40.99 USD

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$ 40.99 USD

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Over time bushings deteriorate and become ineffective. Replace them to reduce noise and harshness. Priced Each. Two required for complete service.

Differential Input Shaft Seal - Priced Each

T#:44021076

Part#: 33121213949

Ships in 2 Business Days

$ 27.99

This product was last offered at the strikethrough price on
05-07-2026

$ 26.99 USD

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$ 26.99 USD

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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.

Corteco Output Shaft Seal - E10, E21

T#:592386

Part#: 33121205302

In Stock

$ 28.99 USD

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$ 28.99 USD

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Seals the axles into the differential

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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Victor Reinz Shaft Seal with Lock Ring - Differential Output Shaft (7...

T#:596464

Part#: 33107510289

Ships in 2 Business Days

$ 22.99

This product was last offered at the strikethrough price on
05-07-2026

$ 22.00 USD

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$ 22.00 USD

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Differential Bushing - Priced Each

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T#:382582

Part#: 33171131903

Ships in 6 Business Days

$ 28.03 USD

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$ 28.03 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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Victor Reinz Shaft Seal - E38, E39, E60, E61, E63, E64, E65, E82, E88...

T#:362359

Part#: 33107505605

Ships in 1-2 days

$ 29.99

This product was last offered at the strikethrough price on
05-07-2026

$ 28.99 USD

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Qty

$ 28.99 USD

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Seals the axle into the differential

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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Qty

$ 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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Victor Reinz Differential Cover Gasket - E31, E32, E34, E39, E46, Z4 ...

T#:362602

Part#: 33108305033

Ships in 2 Business Days

$ 3.01 USD

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$ 3.01 USD

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Seals the rear differential cover

Rear Differential Bushing - Priced Each

We Price Match - Give Us A Call or Chat!

T#:349051

Part#: 33171134872

Ships in 3 Business Days

$ 10.99 USD

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Qty

$ 10.99 USD

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Corteco Output Shaft Seal

T#:583459

Part#: 33107505604

In Stock

$ 14.42

This product was last offered at the strikethrough price on
07-06-2026

$ 11.99 USD

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Qty

$ 11.99 USD

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Seals the axles into the differential

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

Driveshaft Seal

T#:594925

Part#: 31507609535

In Stock

$ 9.99 USD

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Qty

$ 9.99 USD

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Seals the driveshaft to the differential

Victor Reinz Sealing O-Ring - E23, E24, E28, E30, E31, E32, E34, E36,...

T#:375022

Part#: 33111206166

In Stock

$ 2.03 USD

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Qty

$ 2.03 USD

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Used to seal the pulse generator in the differential case

Rear Differential Bushing - Priced Each

T#:594920

Part#: 33171134872

Ships in 2 Business Days

$ 19.99

This product was last offered at the strikethrough price on
05-07-2026

$ 16.99 USD

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Qty

$ 16.99 USD

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The subframe provides mounting for your rear suspension. The subframe connects to the body with bushings to absorb vibration at all mounting locations. These bushings absorb any vibration that would normally be transmitted to the cabin and keep the subframe solid. They also provide a solid mounting location to keep everything tight.

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Front Differential Input Shaft Seal

T#:594926

Part#: 31521428678

Ships in 2 Business Days

$ 17.99 USD

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Qty

$ 17.99 USD

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Seals the input shaft flange to the front differential

Installation Tool - Oil Assembly Aid

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

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Qty

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

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Febi Drain Plug Gasket

We Price Match - Give Us A Call or Chat!

T#:340702

Part#: 07119963355

Ships on Oct 6, 2026

$ 1.99 USD

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Qty

$ 1.99 USD

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22x27 aluminum sealing ring

Febi Rear Differential Carrier Bushing - E53

We Price Match - Give Us A Call or Chat!

T#:382583

Part#: 33176770456

Special Order: No Guaranteed ETA

$ 44.99 USD

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Qty

$ 44.99 USD

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Bushing that presses into the rear subframe at the rear of the differential.

Differential Mounting - Rear Axle, Front

T#:56471642

Part#: 33316792873

Special Order: No Guaranteed ETA

$ 12.99 USD

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$ 12.99 USD

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The Febi Bilstein Rear Axle Differential Mount provides factory-spec structural retention to keep your differential firmly anchored.

Front Differential Bushing - Priced Each

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T#:36032352

Part#: 33176770788

Special Order: No Guaranteed ETA

$ 15.99 USD

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Qty

$ 15.99 USD

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The subframe serves as the mounting point for your rear suspension, connecting to the vehicle's body with bushings designed to absorb vibrations. These bushings minimize vibrations transmitted to the cabin while maintaining a secure and stable connection, ensuring tight and reliable suspension performance.

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Rear Differential Bushing - Priced Each

We Price Match - Give Us A Call or Chat!

T#:375932

Part#: 33171093008

Special Order: No Guaranteed ETA

$ 19.99 USD

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Qty

$ 19.99 USD

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OEM Febi Rear Differential Carrier Bushing - Rear Positiom - E82/88 E...

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T#:382585

Part#: 33176770866

Back Ordered

$ 47.99

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

$ 34.99 USD

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Qty

$ 34.99 USD

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Differential Bushing - Priced Each

We Price Match - Give Us A Call or Chat!

T#:376612

Part#: 33171131903

Back Ordered

$ 11.99 USD

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Qty

$ 11.99 USD

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Replacement (32)

Category

Differential and Gearing Upgrades
- Differential Bushings (17)
- Seals (12)

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