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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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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
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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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Packaged by Turner - Corporate Logo
T#:339943
Part#: E46-MY-DIFF
In Stock
$ 88.99

This product was last offered at the strikethrough price on
02-26-2026

Starting at $ 56.99 USD
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Starting at $ 56.99 USD
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These rubber bushings from Meyle are a direct replacement for the stock differential bushings in the E46 3-series, E83 X3 SAV, and Z4 Roadster. If your original bushings are worn (likely around 100,000 miles) these are a great replacement upgrade. The front bushings are the stock OEM type rubber bushings. The rear bushing is a Meyle HD upgrade over stock - about 15% stiffer than the originals. This means the bushing will not flex and twist as much. This puts more power to the wheels since power is no longer used up for 'torquing' the bushing. These are not race bushings; the rubber material is perfectly suitable for street use.

The non-M E46/E83/Z4 models use three differential mounts - two front bushings in the subframe and one rear mount in the diff cover. This set of bushings covers all three. You can opt to include new mounting hardware in the Options list below.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
2004-2010 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2003-2008 Z4 BMW Z4 2.5i Z4 3.0i Z4 3.0si Roadster
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OEM BMW Rear Differential Mount - E46, E83 X3, E85 Z4
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
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

Corteco - Corporate Logo
T#:44021076
Part#: 33121213949
Ships in 1 Business Day
$ 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
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URO - Corporate Logo
T#:37993429
Part#: 33112282482
In Stock
$ 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
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URO - Corporate Logo
T#:639176
Part#: 33171129784
In Stock
$ 37.41 USD
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This mount connects to the rear differential cover and secures the rear differential to the subframe.

Premium Differential Service Kit - E46 M3, E9X M3, E82 1 M Coupe ...
Includes BMW SAF-XJ limited slip differential fluid with FM booster
Packaged by Turner - Corporate Logo
T#:598688
Part#: E46M3DIFSERTMSKT
In Stock
Sale - Save 8% $ 301.99

This product was last offered at the strikethrough price on
05-03-2026

$ 277.83 USD
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$ 301.99

This product was last offered at the strikethrough price on
05-03-2026

$ 277.83 USD
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Servicing your differential is an important job and should only be completed using high quality components! To ensure our customers are getting exactly what they need, we have put together this limited-slip differential service kit that includes all new fluid from BMW, a new BMW drain plug, and one of our new Titanium Magnetic Differential Drain Plugs!
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Corteco - Corporate Logo
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

Packaged by Turner - Corporate Logo
T#:42133544
Part#: 835225790TKT
In Stock
Sale - Save 2% $ 60.99

This product was last offered at the strikethrough price on
08-04-2026

$ 59.72 USD
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Sale - Save 2%
$ 60.99

This product was last offered at the strikethrough price on
08-04-2026

$ 59.72 USD
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The kit includes 2 Quarts of Red line 75w90 - 57904 and brand new Rein rear diff oil drain plug M22x1.5

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
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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!
URO - Corporate Logo
T#:641882
Part#: 33171134871
Ships in 1 Business Day
$ 27.99 USD
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Differential Bushing - Priced Each
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Febi - Corporate Logo
T#:382582
Part#: 33171131903
Ships in 5 Business Days
$ 28.03 USD
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Packaged by Turner - Corporate Logo
T#:15710761
Part#: 33117525064-KT
In Stock
Sale - Save 2% $ 100.76

This product was last offered at the strikethrough price on
06-15-2026

$ 98.71 USD
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Sale - Save 2%
$ 100.76

This product was last offered at the strikethrough price on
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$ 98.71 USD
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Often overlooked, scheduled rear differential service is very important. Over time gear lube breaks down causing bearings and internal components fail. Regular maintenance will keep your vehicle running properly for years to come. Kit includes 3 Bottles of Castrol SAF-XJ 75w140 2 Drain plugs
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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
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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!
URO - Corporate Logo
T#:385088
Part#: 33171090950
Ships in 1 Business Day
$ 50.99 USD
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Packaged by Turner - Corporate Logo
T#:386282
Part#: E9X-DIFF-MOUNTS
Ships in 1-2 days
$ 193.25 USD
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$ 193.25 USD
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This package of OEM E82 E90 E92 diff mounts replaces the stock rubber diff bushings. On a tuned 335i you may have noticed more driveline shudder or problems hooking up during hard launches. What happens is the stock rubber bushings are under constant flex as engine torque is transmitted through the differential. Under normal driving with a stock car the bushings are rarely stressed. But factor in significant additional torque from a tuned N54/N55 and the stock rubber will quickly show its weaknesses. You may have even broken a diff bolt or two as the heavy differential shifts around. Even non-turbo E82 and E9X models may benefit from fresh bushings.

This is a set of stock rubber bushings, made by OEM supplier Lemforder. They are the same as the Genuine BMW E9X diff mount bushings, but without the more expensive branding. If you're turned off by potential side effects of urethane or Delrin then the OEM diff mounts are your best option. The OEM mounts fit and perform just like the originals so there is no second guessing their quality. If you're looking for an upgrade we offer E9X solid Delrin and aluminum diff mounts that work well, even in street applications.

E9X Diff Mount Set includes:

  • 33176760287 x 2, front differential mount
  • 33176770866 x 1, rear differential mount
  • (new hardware is optional and can be ordered separately below)

    This item fits the following BMWs:
    2008-2012 E82 BMW 128i 135i
    2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi 335d 335i 335xi 335i xDrive - Sedan
    2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
    2007-2013 E92 BMW 328i 328xi 328i xDrive 335i 335is 335xi 335i xDrive - Coupe
    2007-2013 E93 BMW 328i 335i - Convertible
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Packaged by Turner - Corporate Logo
T#:401688
Part#: 33117512980KT
Ships in 3 Business Days
$ 367.99 USD
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$ 367.99 USD
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The perfect upgrade for any E46, this finned differential cover increases cooling to the rear differential to prevent over heating and possible damage. This is a complete kit including fluid and drain plugs.

Includes the following

  • Aluminum finned differential cover
  • Drain & fill plug with sealing o-ring
  • 2 Quarts of Redline 75w90
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Packaged by Turner - Corporate Logo
T#:24344778
Part#: ECSTMSPDBKT
In Stock
Sale - Save 8% $ 1,190.99

This product was last offered at the strikethrough price on
05-03-2026

$ 1,096.14 USD
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Sale - Save 8%
$ 1,190.99

This product was last offered at the strikethrough price on
05-03-2026

$ 1,096.14 USD
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Turner recommends running drivetrain mounts of all the same variety - if you are using poly engine mounts, you should also use poly transmission mounts. This kit is your solution to make sure all components of your vehicle are working with each other to achieve the performance you're looking for. Polyurethane material is more resistant to water, ozone, and chemicals, maintaining its resiliency and elasticity longer than conventional rubber. Keep your vehicle planted for spirited driving while having crisper throttle response and reduce drivetrain movement along with wheel hop. Kit includes: Turner Engine Mount Set - 60A Polyurethane ECS Transmission Mount Set - Street 70A Polyurethane ECS Differential Bushing Set - 95A Polyurethane ECS Subframe Mount Set - 95A - Polyurethane
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Packaged by Turner - Corporate Logo
T#:556968
Part#: 33112282482KT3
Ships on Aug 28, 2026
Sale - Save 7% $ 676.14

This product was last offered at the strikethrough price on
05-03-2026

$ 627.61 USD
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Sale - Save 7%
$ 676.14

This product was last offered at the strikethrough price on
05-03-2026

$ 627.61 USD
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This kit includes Turner Motorsport solid aluminum differential race mounts pre installed in the differential cover for a quick install. These mounts where developed by Turner Motorsport for their Grand-Am Cup E46 M3 race cars, the advantages of solid aluminum mounts is increased suspension & drivetrain response, less drivetrain loss resulting in more wheel horsepower, and longevity - they effectively last forever. These CNC-machined mounts are a direct replacement for the stock rubber pieces, and have been lightened to remove excess weight. 

 

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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
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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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Rear Differential Bushing - Priced Each
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:349051
Part#: 33171134872
Ships in 3 Business Days
$ 10.99 USD
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Corteco - Corporate Logo
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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$ 11.99 USD
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Seals the axles into the differential
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
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$ 18.99

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

$ 15.99 USD
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Replaces cracked or hardened valve body seals
Corteco - Corporate Logo
T#:594925
Part#: 31507609535
In Stock
$ 9.99 USD
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Seals the driveshaft to the differential


Packaged by Turner - Corporate Logo
T#:56327180
Part#: F3XAWDFDKT5
In Stock
New Item
Sale - Save 1% $ 104.99

This product was last offered at the strikethrough price on
08-04-2026

$ 103.54 USD
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Sale - Save 1%
$ 104.99

This product was last offered at the strikethrough price on
08-04-2026

$ 103.54 USD
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This kit combines Red Line 75W85 GL-5 Synthetic Gear Oil with Rein OEM replacement plugs in order to perform a full drain and fill service on both of your differentials
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
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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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Elring - Corporate Logo
T#:54852011
Part#: B16.900
In Stock
New Item
$ 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.

Packaged by Turner - Corporate Logo
T#:15744025
Part#: 331175250640-KT
In Stock
Sale - Save 8% $ 274.99

This product was last offered at the strikethrough price on
05-03-2026

$ 252.18 USD
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Sale - Save 8%
$ 274.99

This product was last offered at the strikethrough price on
05-03-2026

$ 252.18 USD
Free Shipping on orders $49 and up
Often overlooked, scheduled rear differential service is very important. Over time gear lube breaks down causing bearings and internal components fail. Regular maintenance will keep your vehicle running properly for years to come. Three bottle of Genuine BMW Limited Slip Gear Lube 1 New Genuine BMW Drain/Fill plugs 1 ECS Magnetic Differential Oil Drain Plug Drain plug O-ring
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Packaged by Turner - Corporate Logo
T#:56038061
Part#: E9XSBFRDFFBKT2
In Stock
New Item
$ 491.99 USD
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This complete upgrade package is designed to put an end to steering slop. Utilizing a high performance 95A durometer polyurethane formulation, this kit replaces the mushy OEM rubber with proven rigidity.
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Corteco - Corporate Logo
T#:594920
Part#: 33171134872
Ships in 1 Business Day
$ 19.99

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

$ 16.99 USD
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$ 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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Packaged by Turner - Corporate Logo
T#:56327200
Part#: F3XAWDFDKT6
Ships in 1 Business Day
New Item
$ 154.99

This product was last offered at the strikethrough price on
08-07-2026

$ 154.52 USD
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$ 154.52 USD
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This kit combines Motul 75W85 GL-5 Synthetic Gear Oil with Rein OEM replacement plugs in order to perform a full drain and fill service on both of your differentials
Packaged by Turner - Corporate Logo
T#:42099854
Part#: 07512293972T3KT
Ships in 1-3 days
Sale - Save 13% $ 303.99

This product was last offered at the strikethrough price on
05-03-2026

$ 264.15 USD
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Sale - Save 13%
$ 303.99

This product was last offered at the strikethrough price on
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$ 264.15 USD
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Maintain smooth power distribution, protect your drivetrain, and extend the life of your BMW xDrive system with the Complete Xdrive Differential And Transfer Case Service Kit - E90, E91, E92, E60, E61, E70.
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Corteco - Corporate Logo
T#:594926
Part#: 31521428678
Ships in 1 Business Day
$ 17.99 USD
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Seals the input shaft flange to the front differential

Elring - Corporate Logo
T#:53008820
Part#: 33108860348
Ships in 1 Business Day
New Item
$ 44.99

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

$ 43.99 USD
$ 43.99 USD
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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Packaged by Turner - Corporate Logo
T#:56471654
Part#: 27102413711KT2
Ships in 5 Business Days
New Item
$ 228.99 USD
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This Transfer Case Repair Kit provides an exact-fit, OEM grade solution engineered to rebuild the servomotor assembly back to factory operating specifications. Designed for enthusiasts who demand crisp power transfer and exact mechanical feedback from their drivetrain.
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Packaged by Turner - Corporate Logo
T#:56471655
Part#: 27102413711KT3
Ships in 5 Business Days
New Item
$ 228.99 USD
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This Transfer Case Repair Kit provides an exact-fit, OEM grade solution engineered to rebuild the servomotor assembly back to factory operating specifications. Designed for enthusiasts who demand crisp power transfer and exact mechanical feedback from their drivetrain.
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Packaged by Turner - Corporate Logo
T#:56471657
Part#: 27102413711KT4
Ships in 5 Business Days
New Item
$ 228.99 USD
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This Transfer Case Repair Kit provides an exact-fit, OEM grade solution engineered to rebuild the servomotor assembly back to factory operating specifications. Designed for enthusiasts who demand crisp power transfer and exact mechanical feedback from their drivetrain.
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Packaged by Turner - Corporate Logo
T#:56471658
Part#: 27102413711KT5
Ships in 5 Business Days
New Item
$ 228.99 USD
Free Shipping on orders $49 and up
This Transfer Case Repair Kit provides an exact-fit, OEM grade solution engineered to rebuild the servomotor assembly back to factory operating specifications. Designed for enthusiasts who demand crisp power transfer and exact mechanical feedback from their drivetrain.
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Packaged by Turner - Corporate Logo
T#:55353632
Part#: 33108659987KT2
Ships in 1-2 days
New Item
$ 3,481.99 USD
$ 3,481.99 USD
Under hard acceleration, that stock rear diff twists, flexes, and deflects. Robbing your car of power

Packaged by Turner - Corporate Logo
T#:56616382
Part#: 27111226467KT3
Ships in 3 Business Days
New Item
$ 48.99 USD
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This Transfer Case Service Kit replaces degraded fluid and sealing hardware to maintain proper lubrication within the all wheel drive transfer case. Unserviced transfer case fluid breaks down into sludge and deposits, causing lubrication loss and internal component wear; this service kit prevents internal wear by renewing fluid properties and drain hardware.
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Packaged by Turner - Corporate Logo
T#:56616376
Part#: 27111226467KT2
Ships in 3 Business Days
New Item
$ 48.99 USD
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This Transfer Case Service Kit replaces degraded fluid and sealing hardware to maintain proper lubrication within the all wheel drive transfer case. Unserviced transfer case fluid breaks down into sludge and deposits, causing lubrication loss and internal component wear; this service kit prevents internal wear by renewing fluid properties and drain hardware.
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Elring - Corporate Logo
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

Packaged by Turner - Corporate Logo
T#:55965861
Part#: 30309175WKWVTKT2
Ships in 10 Business Days
New Item
$ 1,269.99 USD
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This AutoTech LSD Upgrade Kit pairs AutoTech’s highly engineered 188mm limited-slip differential carrier with a pair of Corteco output shaft seals, giving you everything you need for a leak-free install.
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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
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This OEM-quality replacement shaft seal from Elring is the perfect fix for keeping your gear oil where it belongs.

Febi Drain Plug Gasket
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:340702
Part#: 07119963355
Ships on Oct 6, 2026
$ 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!
Febi - Corporate Logo
T#:382583
Part#: 33176770456
Special Order: No Guaranteed ETA
$ 44.99 USD
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Bushing that presses into the rear subframe at the rear of the differential.
Febi - Corporate Logo
T#:56471642
Part#: 33316792873
Special Order: No Guaranteed ETA
New Item
$ 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.


Febi - Corporate Logo
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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$ 34.99 USD
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Meistersatz - Corporate Logo
T#:599651
Part#: 33107564416
Ships in 2 Business Days
$ 17.99 USD
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$ 17.99 USD
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This item fits the following BMW Chassis: E70 X5,E89 Z4,F01,F02,F06,F10,F12,F13,F15,F16,F22,F25 X3,F26 X4,F30,F31,F32,F33,F34,F36