BMW Drivetrain Parts for BMW 1 Series

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Building your perfect BMW is more than just adding horsepower and stiff suspension. Your drivetrain needs attention in order to deliver power effectively. Most BMWs feature comfortable clutch discs, heavy flywheels, long shifter throws, and open differentials. The drivetrain transmits power to the wheels, but can also be a source of power loss when it is designed for comfort rather than performance. Everything on this page will help you improve your power delivery and driving experience by providing custom Limited Slip Differentials, Short Shift Conversions, Performance Clutch Discs, Lightweight Flywheels, and anything else your BMW needs to be the perfect driving experience.

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Bav Auto Differential, Transfer Case, Transmission Oil-Pan Wrench
Bav Auto Differential, Transfer Case, Transmission Oil-Pan Wrench ...
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T#:580353
Part#: B8800025
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$ 24.74 USD
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$ 32.99

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The proper size for removing BMW drain plugs.
Differential Fluid Extraction Adapter
Differential Fluid Extraction Adapter
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T#:578659
Part#: B3300000
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$ 21.33 USD
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Differential Fluid Extraction Adapter is an essential tool for efficiently draining and refilling differential fluid, ensuring your vehicle's differential system remains in optimal condition. Designed to work with most extraction pumps, this adapter simplifies maintenance tasks, making it easier to service your differential without the mess or hassle of traditional methods.

  • Efficient fluid extraction: Allows for quick and clean draining of differential fluid.
  • Versatile compatibility: Works with most extraction pumps, offering flexibility for various vehicle makes and models.
  • Hassle-free maintenance: Simplifies the process of refilling and draining differential fluid, reducing time and effort.
  • Durable construction: Built from high-quality materials to withstand frequent use and harsh conditions.
  • Easy installation: Designed for a secure fit and easy attachment to extraction pumps.

This Differential Fluid Extraction Adapter is a must-have for any vehicle owner looking to maintain the longevity and performance of their differential system.

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Bav Auto Transmission/Differential Drain Plug Socket Set
Bav Auto Transmission/Differential Drain Plug Socket Set
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T#:580446
Part#: B8800141
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Sale - Save 25% $ 36.99

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$ 27.74 USD
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$ 36.99

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Drain plug socket set. Set of 3 hex-head sockets make removal of transmission and differential drain plugs so much easier. Includes 10mm, 14mm and 17mm sizes. 3/8" drive
Bav Auto Fluid Transfer Pump - 200ml - Viton Seals
Bav Auto Fluid Transfer Pump - 200ml - Viton Seals
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T#:580336
Part#: B8800004
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Sale - Save 25% $ 38.99

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$ 29.24 USD
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Use this high-quality fluid transfer pump to remove old fluid from power steering reservoirs, brake fluid reservoirs or differentials that do not have drain plugs (as on many later model BMWs), or to fill transmissions, differentials, and any other assemblies when changing the fluids.
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Bav Auto Wheel Hub and Rotor Grinding Kit
Bav Auto Wheel Hub and Rotor Grinding Kit
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T#:580437
Part#: B8800132
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$ 43.19 USD
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Used to remove corrosion and ensure brake rotors, wheel spacers, etc sit flush on your hubs
Bav Auto Axle Shaft Impact Force Screw Adapter
Bav Auto Axle Shaft Impact Force Screw Adapter
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T#:580429
Part#: B8800122
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Sale - Save 10% $ 40.99

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$ 36.89 USD
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For use with B8800120 (Hub Puller Adapter) as an impact driver to aid in removal of stuck CV axle shafts.
Bav Auto Fluid Transfer Pump - 1 Liter - Viton Seals
Bav Auto Fluid Transfer Pump - 1 Liter - Viton Seals
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T#:580335
Part#: B8800003
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$ 51.84 USD
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Use this high-quality fluid transfer pump to remove old fluid from power steering reservoirs, brake fluid reservoirs or differentials that do not have drain plugs (as on many later model BMWs), or to fill transmissions, differentials, and any other assemblies when changing the fluids. For draining differentials we recommend using the Bavarian Autosport adapter part # B3300000.
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Bav Auto Hub Adapter / Hub Puller
Bav Auto Hub Adapter / Hub Puller
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T#:580427
Part#: B8800120
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$ 98.99 USD
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For use with B8800122 impact driver to remove stuck CV axle shafts.
Bav Auto Wheel Bearing Tool Master Set
Bav Auto Wheel Bearing Tool Master Set
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Bav Auto Tools - Corporate Logo
T#:580402
Part#: B8800092
Ships on Aug 10, 2026
Sale - Save 5% $ 355.99

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$ 338.19 USD
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For removal and installation of pressed in rear wheel bearings on most BMW's and pressed in front wheel bearing on many all-wheel drive BMWs.
Bav Auto Rear Subframe Bushing Press - E88 E9X BMW
Bav Auto Rear Subframe Bushing Press - E88 E9X BMW
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Bav Auto Tools - Corporate Logo
T#:580432
Part#: B8800127
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Sale - Save 3% $ 419.99

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$ 407.39 USD
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The Bav Auto Rear Subframe Bushing Press allows you to remove and install rear subframe bushings while the subframe is still in the vehicle, saving you several hours of labor.
Bav Auto 36MM 12 Point Socket - 1/2" Drive
Bav Auto 36MM 12 Point Socket - 1/2" Drive
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Bav Auto Tools - Corporate Logo
T#:580421
Part#: B8800114
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$ 22.49 USD
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This is a thin-walled 1/2" drive 36mm impact socket - useful in removing or installing wheel bearing and axle nuts on several BMW models.
Bav Auto Drive Shaft and Differential Nut Remover / Installer
Bav Auto Drive Shaft and Differential Nut Remover / Installer ...
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Bav Auto Tools - Corporate Logo
T#:580440
Part#: B8800135
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Sale - Save 3% $ 271.99

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$ 263.83 USD
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Tool used to install / remove the screw nut between your BMW's rear drive axle and the differential - can also be used in replacing your differential input seal.
Bav Auto Hub Puller Slide Hammer Adapter
Bav Auto Hub Puller Slide Hammer Adapter
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Bav Auto Tools - Corporate Logo
T#:580428
Part#: B8800121
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Sale - Save 18% $ 21.99

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$ 17.99 USD
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Necessary in order to use Bav Auto's Hub Adapter/Puller (B8800120) . 5/8" x 18T UNF thread.
Bav Auto Transmission 17mm Drain Plug Wrench - Manual Transmission
Bav Auto Transmission 17mm Drain Plug Wrench - Manual Transmission ...
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T#:580447
Part#: B8800142
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$ 14.99 USD
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Makes changing your transmission fluid an easy task. 1/2 " drive, for use in BMWs with 17mm female allen transmission drain plugs.
OS Giken Superlock Limited Slip Differential Unit - E82 135i, E9X 335i (LSD)
OS Giken Superlock Limited Slip Differential Unit - E82 135i, E9X 335...
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OS Giken - Corporate Logo
T#:338590
Part#: BM531-HA
Ships in 2 Business Days
Starting at $ 3,700.00 USD
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Starting at $ 3,700.00 USD
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video: E92 335i with limited slip

click for high quality
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 lauch, acceleration, 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.

With the 135i/335i LSD unit, they have incorporated revolutionary new ideas into the design (4 years in the making!) which uses an unprecedented number of friction plates (up to 28 total!) for better locking force, better engagement/disengagement, and less generated heat. The end result of their efforts is the OS Giken's OS Super Lock LSD which offers incredible durability and reliability on street and track driven BMWs. 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. Super smooth and quiet engagement, and 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 Superlock 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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OS Giken TractionControl Limited Slip Differential Unit - E82 135i, E9X 335i (LSD)
OS Giken TractionControl Limited Slip Differential Unit - E82 135i, E...
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OS Giken - Corporate Logo
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
click for high quality

As Used on Project E92 335i
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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