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BMW Differential and Gearing Upgrades for BMW 3 Series E90 (2006-2011)

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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Genuine BMW O-ring - 33111214144

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T#:25199

Part#: 33111214144

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$ 8.99 USD

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Genuine BMW O-Ring - D=90Mm/3Mm
This item fits the following BMW Chassis:
E30 M3,E36 M3,E34 M5,E60 M5,E63 M6,E46 M3,E82 1M Coupe,E85 Z4M,E30,E34,E36,E38,E46,E63,E82,E85 Z4,E86 Z4,E90,E92,E93,F06,F10,F12,F13,F80 M3,F82 M4,F83

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Differential Oil Drain Plug

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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:27405453

Part#: 33117525064

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$ 11.99

This product was last offered at the strikethrough price on
05-21-2026

$ 9.99 USD

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URO Differential Output Shaft Seal W/ Lock Ring - BMW E36 E46 E53 E60...

For pre LCI models 335i, 335is and 335xi, from production date 07/2009

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2X Entries For Our G87 M2 Sweepstakes!

T#:43750219

Part#: 33107505604

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$ 10.00 USD

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Maintaining a proper amount of fluid in the rear differential is vital to the performance and longevity of the differential. If a leaking shaft seal is left untouched, the results could be catastrophic. Two seals required per vehicle.

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Corteco Output Shaft Seal

For pre LCI models 335i, 335is and 335xi, from production date 07/2009

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T#:583459

Part#: 33107505604

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$ 14.42

This product was last offered at the strikethrough price on
07-06-2026

$ 11.99 USD

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Seals the axles into the differential

SKF Seal - Differential Pinion Shaft (50 X 80 X 9 mm)

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T#:588869

Part#: 33121213949

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$ 17.99 USD

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Differential Input Shaft Seal - Priced Each

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T#:49335120

Part#: 33121213949

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$ 18.99 USD

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Replaces cracked or hardened valve body seals

2.81 Pumpkin With Helical LSD

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T#:25573478

Part#: MF-TRS-05E92DKT

Ships in 4 Business Days

$ 2,689.99 USD

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Metal Plate Limited-Slip Differential - 1.0 Way

For vehicles with an automatic transmission For vehicles with a manual transmission

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T#:379404

Part#: MF-TRS-10E90

Ships in 6 Business Days

$ 999.99 USD

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The best way to gain a prominent advantage over the competition is to do it with the MFactory Metal Plate Limited Slip Differential. The smooth consistent distribution of power to the wheels with the MFactory Plate LSD puts the power-to-the-ground and maximises your vehicle's traction. This 1-way differential will provide torque transfer only during acceleration. This set up works the best for the drag race minded drivers. What exactly does an LSD do you ask? Well without an LSD your car is actually 1 wheel drive, in that it can't supply torque to both wheels at the same time and will only supply torque to the wheel with less grip, which is what the shortfall is to an open differential (what most vehicles have). An LSD only lets the wheels spin at different speeds by a limited amount (typically this is a percentage difference) which is when the differential locks and both wheels get power. This is not how locked differentials work such as in off road trucks which supply equal torque and rotational speed to both rear wheels at the same time, which can cause issues with handling. Features: Forged and Cryo-Tempered for unsurpassed toughness Advanced Shot Peening technology for increased surface hardness Coil Spring preload system ensures minimal power loss and maximum response Lower initial pressure ensures maximum durability and chatter-free operation Fully rebuildable with adjustable lock (80-100%) and option for different cam types Cam type provides the option for 2 distinct levels of initial torque transfer Available in 1.0, 1.5, and 2.0 way options

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Front Differential Input Shaft Seal

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T#:594926

Part#: 31521428678

Ships in 1 Business Day

$ 17.99 USD

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Seals the input shaft flange to the front differential

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

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T#:42099854

Part#: 07512293972T3KT

In Stock

Sale - Save 12% $ 303.99

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

$ 268.70 USD

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Sale - Save 12%

$ 303.99

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

$ 268.70 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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Metal Plate Limited-Slip Differential - 1.5 Way E46 / E8X / E9X ...

For vehicles with an automatic transmission For vehicles with a manual transmission

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T#:15478740

Part#: TRS-10E90B-1.5

Ships in 6 Business Days

$ 999.99 USD

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Unleash the full potential of your BMW and gain a competitive edge with the Turner Motorsport MFactory Metal Plate Limited Slip Differential. Engineered for superior performance, this differential ensures a smooth and consistent distribution of power to the wheels, maximizing traction and putting the power firmly on the ground. The 1.5-way design provides torque transfer during acceleration and halfway through deceleration, making it an ideal choice for those focused on track use.

Prominent advantage with the MFactory Metal Plate Limited Slip Differential.
Maximizes traction for enhanced vehicle performance.
1.5-way design for torque transfer during acceleration and deceleration.
Turns your car into a true 2-wheel drive, improving grip.
Ideal for track enthusiasts seeking superior handling.

Upgrade your BMW's drivetrain with the Turner Motorsport MFactory Metal Plate Limited Slip Differential for unmatched toughness and performance.

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OS Giken TractionControl Limited Slip Differential Unit - E82 135i, E...

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T#:338591

Part#: BM531-HC

Ships in 2 Business Days

Starting at $ 2,550.00 USD

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Starting at $ 2,550.00 USD

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video: E92 335i with limited slip

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A turbocharged BMW such as the 135i or 335i needs traction to put that power to the ground. The stock differential of both the 135i and 335i only put power to one wheel -- this just won't cut it! Upgrading to a limited slip differential means power to BOTH wheels, for better launch, acceleration, grip, and track handling. We're excited to be carrying the OS Giken LSD unit in our performance catalog, as we've used their products on our own Championship winning E46 and E92 race cars.

OS Giken's newest innovation is their quietest and smoothest limited slip unit yet - the Traction Control Differential (TCD). TCD is similar to their excellent Superlock differentials but with additional oil channels and pathways. The added lubrication makes diff operation smoother and quieter than before (not that there were many complaints to begin with). The locking engagement is more progressive than before which makes this diff more suitable for street driving. Track cars and drift cars should still use the Superlock LSD as it will transition to lock sooner. TCD is an evolution of a diff that was already extremely well-engineered for road and track use. Not willing to rest on their laurels, they took their superior engineering a step further.

With the 135i/335i LSD unit, they have incorporated revolutionary ideas into the overall limited-slip design which uses an unprecedented number of friction plates (up to 28 total!) for better locking force, better engagement/disengagement, and less generated heat. The use of highest quality materials, precise machining, forged gears, and sound engineering makes this LSD durable and reliable enough for road racing performance (which we can personally vouch for!). Zero break-in required. 100% progressive locking capability.

Installation note: BMW differentials use many unique and BMW-only parts and components. Only technicians who are experienced and familiar with BMW parts should perform the installation. The OS Giken LSD is the limited slip unit (or 'chunk') only. It replaces the stock non-LSD chunk but the original ring and pinion and other internals must be installed with the OS Giken unit. This unit will only work on 335i manual differentials with a bolt-in or modified ring gear. Proper setup and spacing is critical for long life operation. Incorrect installation will void the warranty. We also offer the TCD unit pre-installed - see our performance diff catalog for more info.

The OS Giken TCD Diff unit fits the following BMWs:
2008-2012 E82 BMW 135i with manual transmission
2007-2011 E90 BMW 335i - Sedan with manual transmission
2007-2013 E92 BMW 335i 335is - Coupe with manual transmission
2007-2013 E93 BMW 335i - Convertible with manual transmission

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BMW Differential and Gearing Upgrades for BMW 3 Series E90 (2006-2011)

Sub-Categories

Genuine BMW O-ring - 33111214144

Differential Oil Drain Plug

URO Differential Output Shaft Seal W/ Lock Ring - BMW E36 E46 E53 E60...

Corteco Output Shaft Seal

SKF Seal - Differential Pinion Shaft (50 X 80 X 9 mm)

Differential Input Shaft Seal - Priced Each

2.81 Pumpkin With Helical LSD

Metal Plate Limited-Slip Differential - 1.0 Way

Front Differential Input Shaft Seal

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

Metal Plate Limited-Slip Differential - 1.5 Way E46 / E8X / E9X ...

OS Giken TractionControl Limited Slip Differential Unit - E82 135i, E...

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