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

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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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ECS Complete Performance Polyurethane Differential Bushing Set - 95A ...
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ECS - Corporate Logo
T#:589555
Part#: 026709ECS09
In Stock
Sale - Save 15% $ 183.99

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$ 156.39 USD
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Sale - Save 15%
$ 183.99

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$ 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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Victor Reinz Differential Rear Axle Shaft Seal with Lock Ring - E46 M...
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Victor Reinz - Corporate Logo
T#:7917
Part#: 33107510289
In Stock at Vendor
$ 25.44 USD
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Leaking differential output seals? Replace yours today with this OEM replacement. This seal measures 76x50x10.
Differential - mount bushing
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Whiteline - Corporate Logo
T#:26938502
Part#: KDT919
In Stock
$ 96.99 USD
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After thorough development and material testing aimed at achieving strength, durability, geometry retention, and memory without compromising comfort, WHITELINE has introduced a progressive, long-chain Synthetic Elastomer. This groundbreaking material combines the advantages of solid bushings with the flexibility characteristics of rubber, striking an optimal balance between performance and comfort.
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Metal Plate Limited-Slip Differential - 1.5/2.0 Way, V2
For vehicles with an automatic transmission and production year from Sept 2007+ For vehicles with a manual transmission
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Team MFactory - Corporate Logo
T#:379410
Part#: MF-TRS-10E90B
Back Ordered
$ 999.99 USD
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$ 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 2-way differential will provide torque transfer during both acceleration and deceleration. This means that regardless of whether there is load (throttle) being applied to the differential or not, it will lock up during slippage. Ideal for those with track use in mind. 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 Available in 1.0, 1.5, and 2.0 way options
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Team MFactory Helical Limited Slip Differential (LSD) - BMW E46 E82/8...
For vehicles with manual or automatic transmission (Gear ratio=3.15:1) For Vehicles with automatic transmission (ring gear machining or new ring&pinion requir...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Team MFactory - Corporate Logo
T#:379412
Part#: MF-TRS-05E46A
In Stock
$ 999.99 USD
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$ 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 Helical Limited Slip Differential. The smooth consistent distribution of power to the wheels with the MFactory Helical LSD puts the power to the ground and maximizes your vehicle's traction. A must for any car be it street, strip, or track. 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.
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Differential Input Shaft Seal - E82 E46 E9X E39 E60 Z4
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Genuine BMW - Corporate Logo
T#:7924
Part#: 33121213949
In Stock
5% off MSRP $ 70.61

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

$ 66.99 USD
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5% off MSRP
$ 70.61

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

$ 66.99 USD
Free Shipping on orders $49 and up
Replace your leaking differential input seal with this Genuine BMW part. Whenever service is performed on the differential it is a good idea to check / replace any seals. This seal measures 50mm X 80mm X 9mm. We also recommend you replace the securing plate # 33121205138 at the same time.

This item fits the following BMWs:
2011 E82 BMW 1M Coupe
2001-2006 E46 BMW M3
2008-2011 E90 BMW M3 - Sedan
2008-2013 E92 BMW M3 - Coupe
2008-2013 E93 BMW M3 - Convertible
1988 E28 BMW M5
1991-1995 E34 BMW 540i M5
1999-2003 E39 BMW M5
2006-2010 E60 BMW i M5
2011+ F10 BMW M5
1987-1989 E24 BMW M6
2006-2010 E63 BMW M6
2012+ F12 BMW M6
2013+ F06 BMW M6 Gran Coupe
1988-1994 E32 BMW 740i 740il 750il
1990-1999 E31 BMW 840i 840ci 850i 850ci 850csi
2006-2008 E85 BMW Z4 M Roadster M Coupe
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Open Differential Weld Plates - E8x E9x
For vehicles with automatic transmissions only - medium case differentials
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ECS - Corporate Logo
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
Free Shipping on orders $49 and up

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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Powerflex Performance Polyurethane Rear Differential Bushing Set - Re...
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Powerflex - Corporate Logo
T#:376493
Part#: PFR5-426
In Stock
$ 54.99 USD
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Differential bushings are responsible for keeping the differential in solid alignment while dampening drivetrain vibration. While OE rubber bushings are fine when they are new from the factory, aged and worn out rubber bushings create a multitude of issues that can range from annoying to dangerous. As a factory bushing ages, it begins to harden and become brittle. When this happens the bushing will actually shrink and allow for movement at the differential mounting point. At this point, the differential is free to shift under load causing a noticeable clunking noise under acceleration and deceleration and massively increasing the stress on the driveshaft and axles. Manual transmissions suffer the worst from this as it can make shifting difficult since the differential will shift when the clutch is engaged and disengaged.

By replacing these bushings with full polyurethane, the movement is eliminated since the mounting point is supported by a much stiffer material that will not harden or shrink over time. This means less stress on the driveshaft and axles and greater longevity of supporting components. 

Powerflex street bushings are ideal for street driven vehicles and those that see occasional autocross or track time. Need bushings for a dedicated track car? Powerflex Black Series bushings are the ultimate in track and race bushings. Featuring 95A durometer polyurethane, Black Series bushings are 25% stiffer than street bushings. Engineered to perform, Powerflex performance polyurethane control arm bushings offer a supreme level of control, while still providing enough comfort for the street, with advanced polyurethane that reduces NVH that often accompanies lesser bushings. Expect improved steering feel, turn in, more responsive handling and overall improved chassis composure with Powerflex performance polyurethane control arm bushings.

Poweflex is a leading manufacturer of aftermarket suspension bushings. Using state of the art design and manufacturing, all replacement bushings are engineered to out-perform and out-last the ones that came in the car. Each line of bushings is meticulously tested and then re-tested to ensure perfect fitment and enduring quality through the life of the vehicle. A full lifetime warranty backs every one of their products and demonstrates the level of confidence and commitment Powerflex has to their customers. 

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Differential Rebuild Kit M52 2.8L & M54 2.5L / 3.0L
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Team MFactory - Corporate Logo
T#:381007
Part#: MF-TRS-RBSE46
Ships in 4 Business Days
$ 99.99 USD
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$ 99.99 USD
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Ensure optimal performance for your BMW's differential with the Differential Ring Gear Bolt Kit from Turner Motorsport. Whether you've recently upgraded to a Limited-Slip differential or need to restore your existing one, this kit has you covered. It includes 10 high-quality bolts along with new axle seals to provide complete hardware replacement. Trust ECS Tuning to provide everything you need from start to finish for a hassle-free installation process.
  • Complete hardware replacement kit
  • Includes 10 Differential Ring Gear Bolts and new axle seals
  • Ensures optimal performance for your differential
  • Ideal for upgrading to a Limited-Slip differential or restoring your existing one
  • Hassle-free installation process
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Rear Differential Carrier Bushing - Front Position - E82,E90,E92,E93 ...
This is an M specification bushing and is an upgrade for your vehicle
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:13479
Part#: 33312284019
In Stock
25% off MSRP $ 100.20

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

$ 74.99 USD
Free Shipping on orders $49 and up
25% off MSRP
$ 100.20

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

$ 74.99 USD
Free Shipping on orders $49 and up
BMW M replacement bushing. Great stock replacement for M vehicles or as an upgraded to the non-M bushings.
Team MFactory Differential Seal and Bearing Kit - E46 E82/88 E9X (wit...
For vehicles with an automatic transmission
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Team MFactory - Corporate Logo
T#:381009
Part#: MF-TRS-DBE46S
Ships in 8 Business Days
$ 299.99 USD
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$ 299.99 USD
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Installing a new LSD unit or just performing maintenance on your diff? This kit includes 10 Differential Ring Gear Bolts, new axle seals, and new differential bearings to make your project a bit easier.
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BMW Differential Seal - Rear Axle
For pre LCI models 335i, 335is and 335xi, from production date 07/2009
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:31655802
Part#: 33108860346
Ships in 2 Business Days
2% off MSRP $ 96.58

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

$ 94.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 96.58

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

$ 94.99 USD
Free Shipping on orders $49 and up
Proper fluid levels in the rear differential are crucial for its performance and longevity. Ignoring a leaking shaft seal can lead to severe damage. Each vehicle requires two seals.