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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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Turner Motorsport - Corporate Logo
T#:593924
Part#: 027030TMS01
In Stock
Sale - Save 25% $ 89.99

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06-14-2026

$ 67.49 USD
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$ 89.99

This product was last offered at the strikethrough price on
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$ 67.49 USD
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When both extreme-duty protection and saving every gram matters: the Turner Magnetic Differential Drain Plug.
Turner Motorsport - Corporate Logo
T#:53326250
Part#: 056755LAKT
In Stock
New Item
$ 104.98

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

$ 100.98 USD
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$ 100.98 USD
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Enhance rear-end control and put more power to the ground with a straightforward 3-piece design that installs with ease. The factory rubber may favor ride comfort, but it struggles to keep up when driving gets aggressive. As it wears, the OEM bushing can soften and deform, reducing stability and allowing wheel hop to creep in when you need traction most.

Our 95A durometer polyurethane bushings solve that problem. Engineered to strike the perfect balance between soft factory rubber and harsh solid mounts, they significantly reduce differential movement without introducing excessive vibration. The result is more efficient power transfer, so your torque goes straight to the rear wheels instead of being lost in drivetrain flex.

Features & Benefits:

Minimizes differential movement and instability to help eliminate wheel hop
Two-piece 95A split polyurethane design for easier installation
Precision-fit insert reinforces the bushing and strengthens mounting points
Resistant to road salt, oils, and harsh chemicals
Compatible with dual mount differential plates
Design:

Type II Anodized 6061-T6 CNC billet aluminum inserts for superior corrosion resistance and durability.
95A Polyurethane 2-Piece Isolator.
Product Development:

Our Rear Differential Bushings are designed, engineered, tested, and quality inspected by our Research & Development team. Our development process includes leading-edge product technology: FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

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Loctite - Corporate Logo
T#:25772539
Part#: 5970
Ships in 1 Business Day
$ 55.23 USD
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This Loctite 5970 Sealant is recommended by BMW to be used to seal the rear differential cover and numerous engine oil pans. Also used for multiple MINI, Audi, and VW applications.

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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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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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
06-15-2026

$ 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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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#: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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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
05-03-2026

$ 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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Packaged by Turner - Corporate Logo
T#:56471654
Part#: 27102413711KT2
Ships in 4 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 4 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 4 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#:56471658
Part#: 27102413711KT5
Ships in 4 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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Genuine MINI - Corporate Logo
T#:31589336
Part#: 83192405829
Ships in 7 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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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
Free Shipping on orders $49 and up

Packaged by Turner - Corporate Logo
T#:56616382
Part#: 27111226467KT3
Ships in 5 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 5 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
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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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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.
Meistersatz - Corporate Logo
T#:599651
Part#: 33107564416
Ships in 1 Business Day
$ 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

Packaged by Turner - Corporate Logo
T#:41289766
Part#: 31521428678TKT
Back Ordered
$ 52.99

This product was last offered at the strikethrough price on
07-23-2026

$ 50.99 USD
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$ 50.99 USD
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This kit comes with the seal and both dust covers needed to re-seal your vehicles input shaft on the front differential.