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.

Differential Cover Gasket - E30 E28 E24 E23
Genuine BMW - Corporate Logo
T#:1300
Part#: 33111210405
In Stock
$5.57
Free Shipping
$5.57
Free Shipping


Ring & Pinion Gear Set (R&P only) - 4.10 - E46 M3, E60 M5
Genuine BMW Motorsport - Corporate Logo
T#:21503
Part#: TMS21503
In Stock
5% off MSRP $946.61
$899.28
Free Shipping
5% off MSRP $946.61
$899.28
Free Shipping

E46 M3 Stock Differential Cover With Bushings
Genuine BMW - Corporate Logo
T#:1333
Part#: 33112282482
In Stock
19% off MSRP $225.42
$182.57
Free Shipping
19% off MSRP $225.42
$182.57
Free Shipping
Genuine BMW Driveshaft Seal 33107609536
Genuine BMW - Corporate Logo
T#:20830
Part#: 33107609536
In Stock
14% off MSRP $14.70
$12.62
Free Shipping on orders $99 and up
14% off MSRP $14.70
$12.62
Free Shipping on orders $99 and up

Genuine BMW Axle Shaft Seal With Lock Ring 33107505605
Genuine BMW - Corporate Logo
T#:20829
Part#: 33107505605
In Stock
14% off MSRP $20.05
$17.21
Free Shipping on orders $99 and up
14% off MSRP $20.05
$17.21
Free Shipping on orders $99 and up

Speedometer Sensor - Mounted in Differential - E30 E24 Z3
Genuine BMW - Corporate Logo
T#:10803
Part#: 62168355008
In Stock
15% off MSRP $55.63
$47.24
Free Shipping on orders $99 and up
15% off MSRP $55.63
$47.24
Free Shipping on orders $99 and up
Speedometer Sensor - Mounted in Differential - E36 Z3 E30 325IX
Genuine BMW - Corporate Logo
T#:14056
Part#: 62168357020
In Stock
19% off MSRP $38.33
$30.93
Free Shipping on orders $99 and up
19% off MSRP $38.33
$30.93
Free Shipping on orders $99 and up


Finned Rear Differential Cover - 33112228336 - E36 Z3M S54 S52
Genuine BMW - Corporate Logo
T#:394453
Part#: 33112228336
In Stock
25% off MSRP $601.36
$449.50
Free Shipping
25% off MSRP $601.36
$449.50
Free Shipping

E46, Z4 High Performance Finned Differential Cover
Genuine BMW - Corporate Logo
T#:1095
Part#: 33117512980
In Stock
19% off MSRP $142.79
$116.29
Limited Qty Sale
Free Shipping
19% off MSRP $142.79
$116.29
Limited Qty Sale
Free Shipping

E46 Finned Differential Cover Upgrade Kit
Packaged by Turner - Corporate Logo
T#:401688
Part#: 33117512980KT
In Stock
Sale - Save 5% $207.64
$197.26
Free Shipping
Sale - Save 5% $207.64
$197.26
Free Shipping
E9X M3 6MT Differential Upgrade - Custom Options
Turner Motorsport - Corporate Logo
T#:339945
Part#: TMS20540
Available
Starting at $2,924.00
Free Shipping
Starting at $2,924.00
Free Shipping

E9X M3 DCT Differential Upgrade - Custom Options
Turner Motorsport - Corporate Logo
T#:340269
Part#: TMS213596
Available
Starting at $2,924.00
Free Shipping
Starting at $2,924.00
Free Shipping
OS Giken Limited Slip Differential Fluid - 80w-250 - 1 liter
OS Giken - Corporate Logo
T#:1840
Part#: OS250R
Direct Ship
$49.95
$49.95

OS Giken Superlock Limited Slip Differential Unit - E82 135i, E9X 335i (LSD)
OS Giken - Corporate Logo
T#:338590
Part#: BM531-HA
Direct Ship
Starting at $4,149.90
Starting at $4,149.90

OS Giken TractionControl Limited Slip Differential Unit - E82 135i, E9X 335i (LSD)
OS Giken - Corporate Logo
T#:338591
Part#: BM531-HC
Direct Ship
Starting at $2,889.95
Starting at $2,889.95
Finned Rear Axle Cover - E36
Alpina - Corporate Logo
T#:398837
Part#: 3310131
Direct Ship
$1,363.00
$1,363.00
E46, Z4 Differential Upgrade - Custom Options
Turner Motorsport - Corporate Logo
T#:340178
Part#: TMS340178
Direct Ship
Starting at $1,824.00
Free Shipping
Starting at $1,824.00
Free Shipping


E60 545i/550i Differential Upgrade - Custom Options
Turner Motorsport - Corporate Logo
T#:338769
Part#: TMS21534
Direct Ship
Starting at $1,924.00
Free Shipping
Starting at $1,924.00
Free Shipping