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

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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Sale - Save 25%

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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.

Rear Differential Mounts - Turner Solid Delrin Race - E82, E9X, F22, ...

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

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Sale - Save 15%

$ 372.99

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

$ 317.04 USD

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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

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ECS Magnetic Differential Oil Drain Plug - Most BMW & Mini Models ...

T#:366828

Part#: 009314ECS01A

In Stock

Sale - Save 25% $ 62.99

This product was last offered at the strikethrough price on
06-13-2026

$ 47.24 USD

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Sale - Save 25%

$ 62.99

This product was last offered at the strikethrough price on
06-13-2026

$ 47.24 USD

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You use a magnetic drain plug for your engine oil, right? Why not apply the same proactive thinking to the differential too? This is a direct replacement magnetic differential drain plug for your BMW. It will catch and retain fine and larger metal particles in your diff oil. If you're proactive in your diff oil servicing, you will catch a minor issue long before it becomes a headache. Diff drain plug includes one sealing o-ring. Direct replacement for Genuine BMW part number(s): 33117525064, 33110308370, 33110152626

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ECS Complete Performance Polyurethane Differential Bushing Set - 95A ...

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

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Sale - Save 15%

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

$ 156.39 USD

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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.

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Open Differential Weld Plates - E8x E9x

T#:35121162

Part#: 056350LA01

In Stock

Sale - Save 25% $ 30.99

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

$ 23.24 USD

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Sale - Save 25%

$ 30.99

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

$ 23.24 USD

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Convert your open differential to a locked differential without the costly expense of an LSD replacement.

Get your car ready for aggressive track driving or drifting without purchasing or replacing your differential. The weld-in plates strengthen your diff and allow both wheels to engage simultaneously giving you a more predictable and capable track car.

An open differential allows the wheels to spin at different speeds and sends power to the wheel with the least amount of traction. This may be a good feature for your regular everyday driver but limits you on the track. The weld-in plates simulate a driving experience similar to a limited-slip differential allowing you to put power to both wheels in a low traction area or initiate drifts.

Features and benefits:

Added strength to your differential gears
Converts from open differential
Fabricated to fit in the spider gears for an easier weld and increased confidence
Made from 7 gauge mild steel, formed to fit

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

Sub-Categories

Turner Titanium Magnetic Differential Drain Plug - M22x1.5

Rear Differential Mounts - Turner Solid Delrin Race - E82, E9X, F22, ...

ECS Magnetic Differential Oil Drain Plug - Most BMW & Mini Models ...

ECS Complete Performance Polyurethane Differential Bushing Set - 95A ...

Open Differential Weld Plates - E8x E9x

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