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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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Turner Titanium Magnetic Differential Drain Plug - M22x1.5

T#:593924

Part#: 027030TMS01

In Stock

Sale - Save 25% $ 89.99

This product was last offered at the strikethrough price on
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.

2-Piece Rear Subframe Bushing - Rear Position (95A) - F8X G2X G8X ...

T#:53326250

Part#: 056755LAKT

In Stock

$ 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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Condor Speed Shop Differential Stud Kit - 45mm - E30, E28, E36 318ti,...

T#:578193

Part#: DIFSTKT-1

In Stock

$ 32.00 USD

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$ 32.00 USD

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Condor Speed Shop took the hard work out of removing and reinstalling your differential! If you've ever taken out your diff, you know how much of a pain it is to get the bolt holes to line up during re-installation. They never seem to line up perfectly, and getting the bolts to go in can be time-consuming. Condor's diff studs are designed to make your life a little easier. The diff will line up and lift right into the holes every time. 38mm studs are used with OEM or regular subframe bushings. 45mm studs are used with the 12mm riser subframe bushings. You'll need to pull the driveshaft to drop the diff. Use thread locker during install. Recommended for street or race use. Kit includes: 4 Studs 4 Washers 4 Lock Nuts

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Rear Differential Mounts - OEM/Meyle HD Rubber - E46, X3, Z4 ...

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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Rear Differential Service Kit for various BMW Models

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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$ 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

Differential Service Kit

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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$ 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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Condor Speed Shop Solid Differential Bushing - E30, E28, Z3 & 318ti ...

T#:587122

Part#: DIFE30

Ships in 3 Business Days

$ 55.00 USD

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$ 55.00 USD

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Condor Speed Shop's E30 solid differential bushing is designed for the street and the track. They use UHMW in all of their suspension bushings because it is stiff, has almost zero deflection yet also absorbs some vibration. It will outlast other types of rubber or urethane bushings. With their solid diff bushing, you won't have to worry about any more rubbery flex in your diff during hard acceleration.

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Conder Speed Shop Solid Transmission Mounts - BMW F22/23 F3X RWD ...

T#:597365

Part#: TRANSIX_F2XF3X

In Stock at Vendor

$ 34.00 USD

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$ 34.00 USD

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These UHMW race grade transmission mounts are the ultimate solution to keep your transmission from moving under heavy load or acceleration. Transmission movement or "play" can cause missed shifts and extreme mechanical damage in some cases.

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Poly Transmission Mount Set

T#:597363

Part#: TRANSIX_E39P

Ships in 2 Business Days

$ 35.00 USD

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$ 35.00 USD

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The 70A poly mounts are the solution if you are trying to minimize vibration and NVH. They are currently the softest polyurethane mounts on the market. We suggest these for all street cars. If you are building a track car, check out the solid UHMW transmission mounts from Condor Speed Shop.

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ECS & Turner Performance Drivetrain Bushing Package - E82/88 E9X N52 ...

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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$ 1,190.99

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$ 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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Front and Rear Differential Service Kit - F3x

T#:56327180

Part#: F3XAWDFDKT5

In Stock

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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$ 104.99

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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

Differential Service Kit

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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$ 274.99

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

$ 252.18 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. 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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Complete Performance Polyurethane Differential And Subframe Bushing S...

T#:56038061

Part#: E9XSBFRDFFBKT2

In Stock

$ 491.99 USD

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$ 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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Complete Xdrive Differential And Transfer Case Service Kit - E90, E91...

T#:42099854

Part#: 07512293972T3KT

Ships in 1-2 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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Front and Rear Differential Service Kit - F3x

T#:56327200

Part#: F3XAWDFDKT6

Ships in 2 Business Days

$ 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

Genuine BMW Transfer Case Repair Kit - E70/E71

T#:56471655

Part#: 27102413711KT3

Ships in 3 Business Days

$ 228.99 USD

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$ 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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Genuine BMW Transfer Case Repair Kit - E53

T#:56471654

Part#: 27102413711KT2

Ships in 3 Business Days

$ 228.99 USD

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$ 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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Pre-XDrive Transfer Case Service Kit - E53

T#:56616382

Part#: 27111226467KT3

Ships in 7 Business Days

$ 48.99 USD

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$ 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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Pre-XDrive Transfer Case Service Kit - E46

T#:56616376

Part#: 27111226467KT2

Ships in 7 Business Days

$ 48.99 USD

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$ 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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Genuine BMW Transfer Case Repair Kit - E90

T#:56471658

Part#: 27102413711KT5

Ships in 3 Business Days

$ 228.99 USD

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$ 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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Genuine BMW Transfer Case Repair Kit - E83

T#:56471657

Part#: 27102413711KT4

Ships in 3 Business Days

$ 228.99 USD

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$ 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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Limited Slip Differential With Output Shaft Seal - 188 (Small Diff Ho...

T#:55965861

Part#: 30309175WKWVTKT2

Ships on Aug 27, 2026

$ 1,269.99 USD

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$ 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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Front Differential Input Seal Kit - E46, E53, E60, E61, F30

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.

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