BMW Differential and Gearing Upgrades for BMW 3 Series E30 (1984-1991)

Clear BMW chassis

Please ensure your correct model is selected

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.

Sub-Categories

Sort By:

Genuine BMW Rubber Mounting - 33172228425
Upgrade from the Z3 M, adds stiffness to the rear with out a harsh increases in NVH
Genuine BMW - Corporate Logo
T#:59637
Part#: 33172228425
In Stock
2% off MSRP $ 301.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 295.99 USD
Free Shipping
2% off MSRP
$ 301.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 295.99 USD
Free Shipping
Genuine BMW RUBBER MOUNTING
Genuine BMW - Corporate Logo
T#:7914
Part#: 33101210518
Ships in 4 Business Days
2% off MSRP $ 148.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 145.99 USD
Free Shipping
2% off MSRP
$ 148.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 145.99 USD
Free Shipping


Genuine BMW Gasket Set Differential - Typ 188
This item fits the following BMW Chassis:
E30 M3,E30

Genuine BMW - Corporate Logo
T#:1062
Part#: 33112228335KIT
Ships in 4 Business Days
$ 660.00 USD
Free Shipping
$ 660.00 USD
Free Shipping

 

This factory finned differential cover bolts directly to the E30 diff housing. This is a must for track cars with limited slip differentials. The clutch packs in these diffs generate a lot of heat, the more heat you can dissipate the better. The fins on this cover will do just that. This is an inexpensive upgrade that may save you a lot of money down the road. Plus it looks cool.

Kit includes cover, gasket and all necessary hardware.:

  • 1 x 33112228335 - Differential Cover
  • 1 x 33111210405 - Differential Gasket
  • 2 x 07119914114 - Bolt
  • 4 x 07119921522 - Bolt
  • 2 x 07119921541 - Bolt

The following photo of the cover with bushing is just representation of this kit. 

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is M3

Show More Show Less

Genuine BMW - Corporate Logo
T#:394453
Part#: 33112228336
In Stock
3% off MSRP $ 617.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 598.99 USD
Free Shipping
3% off MSRP
$ 617.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 598.99 USD
Free Shipping

An OE replacement for your leaking or damaged rear differential cover.

Fits the following BMW's:
E36 BMW Z3  S54 & S52


Genuine BMW - Corporate Logo
T#:214508
Part#: 33131204568
Ships in 4 Business Days
3% off MSRP $ 108.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 105.99 USD
Free Shipping
3% off MSRP
$ 108.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 105.99 USD
Free Shipping


Genuine BMW Tapered Roller Bearing -

This item fits the following BMW Chassis:
E36

>
Genuine BMW - Corporate Logo
T#:59180
Part#: 33111208047
Ships in 10 Business Days
3% off MSRP $ 165.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD
Free Shipping
3% off MSRP
$ 165.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD
Free Shipping


Genuine BMW Transmission Cover
This item fits the following BMW Chassis:
E30 M3,E36 M3,E30,E34,E36


Genuine BMW - Corporate Logo
T#:59558
Part#: 33139065735
Ships in 4 Business Days
2% off MSRP $ 231.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 226.99 USD
Free Shipping
2% off MSRP
$ 231.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 226.99 USD
Free Shipping


Genuine BMW Spacer Rings Set - 1,72Mm-1,96Mm
This item fits the following BMW Chassis:
E30 M3,E36 M3,E30,E34,E36