BMW Differential and Gearing Upgrades for BMW 3 Series E91 (2006-2012)

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:

Rear Differential Mounts - Turner Solid Delrin Race - E82, E9X, F22, ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Turner Motorsport - Corporate Logo
T#:1997
Part#: TDR9080BD2
In Stock
Sale - Save 15% $ 372.99

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

$ 317.04 USD
Free Shipping
Sale - Save 15%
$ 372.99

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

$ 317.04 USD
Free Shipping
Made in the USA TMS E90/E92/E82 (NON M) solid differential mounts are designed around current Grand Am Cup regulations, derived from, and currently used in TMS racecars. Thick Delrin casings are used as the non-metallic solid bushing. Replacing your differentials rubber mounts with this kit will result in a snappier feel when cornering and better suspension performance. You save money by never having to replace the stock rubber mounts that fail due to old age and fatigue. These bushings are CNC machined in the USA and made with high-grade materials.

These solid differential bushings/mounts fit the following BMWs:
2008-2012 E82 BMW 128i 135i
2014+ F22 BMW 228i 228iX M235i M235iX
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
2012+ F30 BMW 320i 320iX 328i 328iX 335i 335iX - Sedan
2012+ F31 BMW 328i 328iX - Wagon
2014+ F34 BMW 328i 328iX 335iX - Gran Turismo
2014+ F32 BMW 428i 428iX 435i 435iX - Coupe
2014+ F33 BMW 428i 428iX 435i 435iX - Convertible
Show More Show Less
ECS Complete Performance Polyurethane Differential Bushing Set - 95A ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ECS - Corporate Logo
T#:589555
Part#: 026709ECS09
In Stock
Sale - Save 15% $ 183.99

This product was last offered at the strikethrough price on
06-14-2026

$ 156.39 USD
Free Shipping
Sale - Save 15%
$ 183.99

This product was last offered at the strikethrough price on
06-14-2026

$ 156.39 USD
Free Shipping
Upgrade your worn OE rubber bushings with ECS Tuning's Performance Polyurethane Differential Bushing Set. In-House Engineered to improve power delivery and handling, with a superior service life over the soft factory rubber bushings.
Show More Show Less
Differential Shim Kit E46 325Ci / 325i / 328Ci / 328i / 330Ci / 330i ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Team MFactory - Corporate Logo
T#:1762239
Part#: MF-TRS-SKE46
Ships in 3 Business Days
$ 199.99 USD
Free Shipping
$ 199.99 USD
Free Shipping

Streamline the setup process for your Limited Slip Differential (LSD) with this mandatory back-lash setting tool. This custom-designed tool is instrumental in reducing installation time by a whopping 50%! It's important to note that this tool is not part of BMW's offerings. Should there be any defects or warranty-related matters, it's advisable to directly reach out to Team M Factory for prompt resolution.

Show More Show Less

Complete Xdrive Differential And Transfer Case Service Kit
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:587067
Part#: 07512293972TKT
In Stock
$ 184.99

This product was last offered at the strikethrough price on
06-03-2026

$ 179.99 USD
Free Shipping
$ 179.99 USD
Free Shipping

Rear Differential Mounts - OEM Rubber - E82, E9X
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Packaged by Turner - Corporate Logo
T#:386282
Part#: E9X-DIFF-MOUNTS
Ships in 1 day
$ 193.25 USD
Free Shipping
$ 193.25 USD
Free Shipping

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
Show More Show Less
Differential Front Mount Bush Kit E8X E9X F3X
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
SuperPro - Corporate Logo
T#:385198
Part#: SPF3950K
In Stock at Vendor
$ 119.99 USD
Free Shipping
$ 119.99 USD
Free Shipping

SuperPro Differential Bushings for BMW

Upgrade your BMW's driveline with SuperPro differential bushings to enhance road feel and reduce driveline slop. While stock bushings excel at insulating the cabin from vibrations, they often lack in improving road feedback. SuperPro's differential bushings are engineered to better locate your driveline, providing a more connected driving experience and improved power delivery to the road surface. With over 40 years of experience in manufacturing suspension components and bushings, SuperPro leads the industry in polyurethane technology. These bushings are not just replicas of stock ones; they are meticulously developed to leverage the unique properties of SuperPro's polyurethane blend, ensuring top-notch performance. Expect consistent quality, precise fitment, and minimal increase in noise, vibration, and harshness (NVH) with SuperPro differential bushings.

  • Enhances road feel and connection to the driving experience
  • Reduces driveline slop for improved power delivery
  • Superior polyurethane technology for optimal performance
  • Meticulously developed and extensively tested for quality assurance
  • Minimal increase in noise, vibration, and harshness (NVH)
Show More Show Less

Genuine BMW Front And Rear Differential Service Kit
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:577470
Part#: 075122939722KT
In Stock
$ 89.99 USD
Free Shipping
$ 89.99 USD
Free Shipping
E9X 325i/328i/330i Differential Upgrade - 3.64 Original BMW
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:338092
Part#: 33107566176
Ships in 7 Business Days
Starting at $ 2,412.29 USD
Free Shipping
Starting at $ 2,412.29 USD
Free Shipping

This is a complete differential to change the gearing of a manual transmission E90/E92 325i, 328i, or 330i (not for xi models) to a 3.64 ratio final drive. The standard gearing on the manual transmission cars is 3.15 or 3.23, making this E90 diff significantly shorter. This diff is from a 330i automatic where the gear ratio has to be shorter to make up for the transmission gearing differences and extra weight. This will dramatically improve acceleration on any 325i, 328i or 330i INSTANTLY! If you are looking for better off-the-line or rolling acceleration, and are willing to sacrifice a little top-speed (some of us don't get up to 150mph), this is one of the best ways to achieve it with almost no downside. There are few things that can improve your 0-to-60 and 0-to-100 times as much as shorter gearing, and this differential is clearly a best "bang-for-buck" solution for dramatically better acceleration. Since this is an Original BMW part it carries the same BMW two year warranty as any other new part. So there's no need to take a chance on a used part from a private seller. (former BMW part number 33107519944)

Changing gear ratio changes the RPM range for any given speed. Use the chart below for examples of speed vs RPM changes for the 3.64 diff.
 

2006 330i, 6-speed manual, stock 3.15 gears, 255/35-18" rear tires

Gear RatioGearSpeedRPM

40 MPH in 4th

3.154th40 MPH2,100 RPM

3.644th40 MPH2,400 RPM

70 MPH Cruise

3.156th70 MPH2,500 RPM

3.646th70 MPH2,900 RPM

5th Gear Speed @ 6,000 RPM

3.155th142 MPH6,000 RPM

3.645th123 MPH6,000 RPM

Why 5th? Because 6th does not have the mechanical advantage to get past wind resistance at these speeds - it is more of a cruise/overdrive gear. Using 5th for comparison purposes is much more relevant than having to take into account wind direction, resistance, grade, elevation, tire sizing, etc. These numbers are for comparisons among gear ratios only, not to determine what your E90 will top out at.2006-2011 325i or 328i, 6-speed manual, stock 3.23 gears, 255/35-18" rear tires

(click to expand)

Gear RatioGearSpeedRPM

40 MPH in 4th

3.234th40 MPH2,150 RPM

3.644th40 MPH2,400 RPM

70 MPH Cruise

3.236th70 MPH2,600 RPM

3.646th70 MPH2,900 RPM

5th Gear Speed @ 6,000 RPM

3.235th138 MPH6,000 RPM

3.645th123 MPH6,000 RPM

Speed in 5th gear at 6,000 RPM is for theoretical and comparison purposes only. It doesn't mean that these speeds are actually reachable.


A $100 refundable core charge must be added at the time of order. This core charge can be refunded when you ship your original diff back to us.

This item fits the following BMWs with manual transmission only:
2006-2011 E90 BMW 325i 328i 330i - Sedan
2006-2012 E91 BMW 325i 328i - Wagon
2007-2013 E92 BMW 328i - Coupe
2007-2013 E93 BMW 328i - Convertible

Show More Show Less