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Elring 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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Shaft Seal
Shaft Seal
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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
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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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Elring Differential Axle Seal - E30 E36 E28 E34 E24 E23 E32 Z3
Elring Differential Axle Seal - E30 E36 E28 E34 E24 E23 E32 Z3 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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
$ 10.45

This product was last offered at the strikethrough price on
01-08-2026

$ 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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OEM Elring Rear Differential Axle Shaft Seal - BMW F3X G2X G8X & More
OEM Elring Rear Differential Axle Shaft Seal - BMW F3X G2X G8X & More...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Elring - Corporate Logo
T#:53008820
Part#: 33108860348
In Stock at Vendor
New Item
$ 44.99

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

$ 43.99 USD
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$ 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 E53
Elring Differential Output Shaft Seal - BMW E82 E9X Z4 E39 E60 E63/64...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Elring - Corporate Logo
T#:44767282
Part#: 082.770
In Stock
$ 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
Shaft Seal - Differential (Axle Drive)
Shaft Seal - Differential (Axle Drive)
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Elring - Corporate Logo
T#:54852004
Part#: B46.610
Ships on Jul 24, 2026
New Item
$ 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.
Seal Set, Electric Motor
Seal Set, Electric Motor
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Elring - Corporate Logo
T#:54852011
Part#: B16.900
Ships on Jul 24, 2026
New Item
$ 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.
Elring Differential Input Shaft Seal - 50x80x9mm - BMW E82 1M, E46 M3, E9X M3, F8X M3 M4
Elring Differential Input Shaft Seal - 50x80x9mm - BMW E82 1M, E46 M3...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Elring - Corporate Logo
T#:44733256
Part#: 703.190
Special Order: No Guaranteed ETA
$ 34.99 USD
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$ 34.99 USD
Free Shipping on orders $49 and up
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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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