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BMW Differential and Gearing Upgrades

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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OEM BMW Rear Differential Mount - E46, E83 X3, E85 Z4
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Febi - Corporate Logo
T#:12525
Part#: 33176751808
In Stock
$ 44.99

This product was last offered at the strikethrough price on
04-18-2026

$ 27.99 USD
Free Shipping on orders $49 and up
$ 27.99 USD
Free Shipping on orders $49 and up
RUBBER MOUNTING REAR:331020
Wavetrac - Corporate Logo
T#:363686
Part#: 30309170WKWVT
In Stock
$ 1,245.50 USD
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$ 1,245.50 USD
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Introducing the Wavetrac® Torque Biasing Differential by Turner Motorsport, the pinnacle of innovation for your BMW. This cutting-edge technology takes your vehicle's performance to a whole new level. With its patented design, the Wavetrac® differential is a trailblazer, automatically enhancing grip when navigating low-traction conditions. Its approach is truly revolutionary, setting it apart from other torque biasing differential designs.

Quality is the hallmark, featuring high-strength 9310 steel gears enclosed in case-hardened billet or forged steel bodies. Throughout the differential, ARP® fasteners are used, ensuring superior durability and performance. What's more, the Wavetrac® differential is virtually maintenance-free, promising a lifetime of service without the need for rebuilds.

To provide added confidence, all Wavetrac® differentials are backed by a transferable limited lifetime warranty, highlighting the product's reliability and longevity.

Important Note for Bolt Kits:

For vehicles equipped with a welded ring gear, the installation process requires the removal, drilling, and installation of the welded ring gear from your stock differential. This intricate task should be entrusted to a professional machine shop. To seamlessly install the ring gear onto the new differential, you'll need Bolt Kit ES4368731. It's imperative to consult your machine shop before purchasing this item and the necessary hardware kit.

Please be aware that no technical drawings or instructions are provided, underscoring the importance of verifying compatibility and ensuring correct installation with your chosen machine shop. Refunds or replacements will not be offered in the event of incorrect ring gear installation or differential failure due to improper installation.

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Active Autowerke - Corporate Logo
T#:397248
Part#: 13-004
Ships in 8 Business Days
5% off MSRP $ 429.00

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

$ 408.00 USD
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5% off MSRP
$ 429.00

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

$ 408.00 USD
Free Shipping

The main mounting bolt for the differential in the E36 is susceptible to shearing off during extreme driving conditions. This can cause internal damage to your diff, leaving you stranded at the track or on the side of the road. Active Autowerke's differential support bracket eliminates this issue forever in under an hour installation.

 

Previously used Active Autowerke Part Number AA-DSB-E36

This product fits the following BMWs:
1992-1999 E36 323i 325i 328i M3

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Shaft Seal
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Elring - Corporate Logo
T#:591509
Part#: 11117568263
In Stock
$ 22.99 USD
Free Shipping on orders $49 and up
Ideal for engine repairs or addressing leaks into the transmission bell housing, this shaft seal is designed to be mounted on the engine block's upper and lower halves, facing towards the transmission housing.
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Differential Bushing - Priced Each
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Febi - Corporate Logo
T#:382582
Part#: 33171131903
Ships in 5 Business Days
$ 28.03 USD
Free Shipping on orders $49 and up
Wavetrac - Corporate Logo
T#:363875
Part#: 30309165WKWVT
Back Ordered
$ 1,595.00 USD
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$ 1,595.00 USD
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Upgrade your BMW S54 3.2L & S65 4.0L Engines with the Turner Motorsport Wavetrac Limited Slip Differential. Featuring patented Wavetrac® design, this innovative differential automatically enhances grip in low traction conditions, providing superior performance compared to traditional designs. Crafted with high-strength 9310 steel gears and ARP® fasteners, this differential ensures durability and reliability. Maintenance-free and backed by a limited lifetime warranty, the Wavetrac® differential offers peace of mind and exceptional performance for your BMW.

  • Patented Wavetrac® design improves grip in low traction conditions
  • High-strength 9310 steel gears ensure durability
  • Maintenance-free operation for the lifetime of the differential
  • Backed by a limited lifetime warranty for added assurance
  • Enhances performance and driving experience for BMW owners
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Wavetrac - Corporate Logo
T#:383304
Part#: 30309175WKWVT
Ships in 10 Business Days
$ 1,245.99 USD
Free Shipping
$ 1,245.99 USD
Free Shipping

The Wavetrac® Torque Biasing Differential introduces an innovative solution for BMW enthusiasts. With its patented design, the Wavetrac® differential automatically enhances grip in low-traction conditions, setting it apart from conventional torque biasing differential designs.

Crafted with precision, the Wavetrac® differential features high-strength 9310 steel gears encased in case-hardened billet or forged steel bodies. ARP® fasteners are utilized throughout the differential, ensuring robustness and exceptional performance.

One of the defining features of the Wavetrac® differential is its maintenance-free design. Fresh from the factory, it's engineered to deliver a lifetime of service without the need for regular maintenance or rebuilds. To bolster the commitment to durability, all Wavetrac® differentials come with a transferable limited lifetime warranty.

For those seeking additional technical insights, comprehensive information on the Wavetrac® Differential can be found at this link: Wavetrac Technical Information.

It's important to note that the Wavetrac® differential is compatible with gear ratios of 3.15 and higher.

Important Note for Bolt Kits:

For vehicles equipped with a welded ring gear, the installation of this differential necessitates the removal, drilling, and installation of the welded ring gear from your stock differential. A Bolt Kit ES4368731 is an essential component for installing the ring gear onto the new differential. We strongly recommend consulting with a professional machine shop before purchasing this item and the necessary hardware kit. Please be aware that no technical drawings or instructions are provided, underscoring the importance of verifying compatibility and ensuring correct installation with your chosen machine shop.

It's crucial to be aware that no refunds or replacements will be offered if the differential has been installed or machined, or in the event of incorrect ring gear installation or differential failure due to improper installation.

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Genuine BMW M Performance - Corporate Logo
T#:402424
Part#: 33108659989
In Stock
2% off MSRP $ 3,370.00

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

$ 3,310.99 USD
Free Shipping
2% off MSRP
$ 3,370.00

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

$ 3,310.99 USD
Free Shipping
Ensure your getting all the power you can to the road with this LSD from BMW Performance

Wavetrac - Corporate Logo
T#:383303
Part#: 30309150WKWVT
Ships in 2 Business Days
$ 1,245.99 USD
Free Shipping
$ 1,245.99 USD
Free Shipping
Wavetrac® Torque Biasing Differential - Innovative: Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike and other torque biasing differential design. - Superior Materials: High strength 9310 steel gears are used in case-hardened billet or forged steel bodies. ARP® fasteners are used throughout the differential. - Maintenance Free: As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds. - Limited LIFETME Warranty: All Wavetrac® differntials include a transferable, limited lifetime warranty. *Additional technical information on the Wavetrac® Differential can be found at the following link: http://www.wavetrac.net/technical.htm
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Wavetrac - Corporate Logo
T#:22723746
Part#: 56309191WK
Ships in 2 Business Days
$ 1,065.99 USD
Free Shipping on orders $49 and up
  • Innovative: Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing differential design.
  • Superior Materials: High strength 9310 steel gears are used in case-hardened billet or forged steel bodies. ARP® fasteners are used throughout the differential.
  • Maintenance Free: As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.
  • Limited LIFETIME Warranty: All Wavetrac® differentials include a transferable, limited lifetime warranty.
  • Show More Show Less
    Wavetrac - Corporate Logo
    T#:363876
    Part#: 30309172WKWVT
    Ships in 2 Business Days
    $ 1,245.99 USD
    Free Shipping
    $ 1,245.99 USD
    Free Shipping
    Wavetrac® Torque Biasing Differential Innovative: Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing differential design. Superior Materials: High-strength 9310 steel gears are used in case-hardened billet or forged steel bodies. ARP® fasteners are used throughout the differential. Maintenance Free: As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds. Additional technical information on the Wavetrac® Differential can be found at the following link: http://www.wavetrac.net/technical.htm For vehicles with a welded ring gear: This differential requires the welded ring gear from your stock differential to be removed, drilled, and installed at a professional machine shop. Bolt Kit ES4368731Wavetrac® Torque Biasing Differential Innovative: Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing differential design. Superior Materials: High-strength 9310 steel gears are used in case-hardened billet or forged steel bodies. ARP® fasteners are used throughout the differential. Maintenance Free: As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds. Additional technical information on the Wavetrac® Differential can be found at the following link: http://www.wavetrac.net/technical.htm For vehicles with a welded ring gear: This differential requires the welded ring gear from your stock differential to be removed, drilled, and installed at a professional machine shop. Bolt Kit T#1377522 is required to install the ring gear to the new differential. No technical drawings or instructions are provided, please check with your machine shop before purchasing this item and/or the required hardware kit! No refunds or replacements will be offered if the differential has been installed or machined or in the event of incorrect ring gear installation or differential failure due to incorrect installation.
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    Wavetrac - Corporate Logo
    T#:383305
    Part#: 30309176WKWVT
    Ships in 2 Business Days
    $ 1,245.99 USD
    Free Shipping on orders $49 and up

    Upgrade your BMW E46 with the Turner Motorsport Wavetrac Limited Slip Differential, featuring innovative design and superior materials for enhanced performance. This differential utilizes patented Wavetrac technology to automatically improve grip in low-traction conditions, setting it apart from traditional torque biasing differentials. Here are the key benefits:

    • Innovative design improves grip in low traction conditions
    • High-strength 9310 steel gears ensure durability
    • ARP fasteners used throughout for reliability
    • Maintenance-free operation for the lifetime of the differential
    • Transferable limited lifetime warranty for peace of mind

    For additional technical information, visit: http://www.wavetrac.net/technical.htm

    Fits ratios 2.47 – 3.07.

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    Wavetrac - Corporate Logo
    T#:640442
    Part#: 56309190WK
    Ships in 10 Business Days
    $ 975.99 USD
    Free Shipping
    $ 975.99 USD
    Free Shipping

    Boost Traction with Wavetrac® Torque Biasing Differential

    Elevate your vehicle's performance with the revolutionary Wavetrac® Torque Biasing Differential. It boasts a patented design that automatically enhances traction when faced with low-grip conditions, setting it apart from other torque biasing differential systems.

    Manufactured with precision, this superior differential features high-strength 9310 steel gears housed within case-hardened billet or forged steel bodies. The use of ARP® fasteners throughout the differential ensures exceptional durability and reliability.

    What makes the Wavetrac® truly exceptional is its maintenance-free operation. You can rely on it to deliver consistent performance throughout its lifetime, without the need for regular maintenance or rebuilds. Additionally, it comes with a transferable limited lifetime warranty for your peace of mind.

    For in-depth technical information about the Wavetrac® Differential, visit our [Technical Information](http://www.wavetrac.net/technical.htm).

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    Rear Differential Bushing - Priced Each
    We Price Match - Give Us A Call or Chat!
    Febi - Corporate Logo
    T#:349051
    Part#: 33171134872
    Ships in 3 Business Days
    $ 10.99 USD
    Free Shipping on orders $49 and up
    Elring Differential Axle Seal - E30 E36 E28 E34 E24 E23 E32 Z3 ...
    2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
    Elring - Corporate Logo
    T#:369495
    Part#: 33107505602
    In Stock
    $ 9.64 USD
    Free Shipping on orders $49 and up

    Rubber seals are often hardened and damaged by excessive heat and constant temperature changes causing them to become brittle and crack or split. If your seal has split, replace it with a new Elring seal for long reliability and to prevent further problems.

    Elring is one of the biggest OEM names in the manufacturing of high quality gaskets that are available for very affordable prices. Elring has supplied many automotive names for years with the gaskets that seal your car's components from day 1 so you can rest assured that these components will last for a long time to come!

    Fits the following BMW engines:
    E30 318i/is 325e 325i/ix M3
    E36 318i/ic/is/ti 323i/is 325i/is 328i/is M3
    E28 524td 528e 533i 535i
    E34 525i 530i 535i
    E24 633CSi 635CSi
    E23 733i 735i
    E32 735i/iL
    Z3 1.9 2.5 2.5i 2.8 3.0i M Coupe/Roadster

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    Elring - Corporate Logo
    T#:54852011
    Part#: B16.900
    In Stock
    New Item
    $ 33.99 USD
    Free Shipping on orders $49 and up
    This high-grade Elring replacement gasket set is engineered for drivers who demand factory-level reliability and zero-compromise sealing performance.

    Genuine MINI - Corporate Logo
    T#:31589336
    Part#: 83192405829
    Ships in 7 Business Days
    8% off MSRP $ 36.99

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

    $ 33.99 USD
    Free Shipping on orders $49 and up
    8% off MSRP
    $ 36.99

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

    $ 33.99 USD
    Free Shipping on orders $49 and up
    Elring - Corporate Logo
    T#:44767282
    Part#: 082.770
    Special Order: No Guaranteed ETA
    $ 24.99 USD
    Free Shipping on orders $49 and up
    $ 24.99 USD
    Free Shipping on orders $49 and up
    Eliminate differential leaks with all new output shaft axle seals from Elring Replaces BMW p/n 33107568368, 33107505605, & 33100152629

    Elring - Corporate Logo
    T#:44733256
    Part#: 703.190
    Special Order: No Guaranteed ETA
    $ 34.99 USD
    Free Shipping on orders $49 and up
    If your differential is leaking fluid from the input shaft at the front of the diff case, there is a good chance this seal is faulty. Replace your leaking seal with this new seal from Elring to prevent further fluid loss and prevent damage to your differential. Replaces BMW p/n 33121213949, 33121212197, & 33121204847
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    Elring - Corporate Logo
    T#:54852004
    Part#: B46.610
    Special Order: No Guaranteed ETA
    New Item
    $ 14.99 USD
    Free Shipping on orders $49 and up
    This OEM-quality replacement shaft seal from Elring is the perfect fix for keeping your gear oil where it belongs.

    Febi Drain Plug Gasket
    We Price Match - Give Us A Call or Chat!
    Febi - Corporate Logo
    T#:340702
    Part#: 07119963355
    Ships on Oct 6, 2026
    $ 1.99 USD
    Free Shipping on orders $49 and up
    22x27 aluminum sealing ring

    Febi Rear Differential Carrier Bushing - E53
    We Price Match - Give Us A Call or Chat!
    Febi - Corporate Logo
    T#:382583
    Part#: 33176770456
    Special Order: No Guaranteed ETA
    $ 44.99 USD
    Free Shipping on orders $49 and up
    Bushing that presses into the rear subframe at the rear of the differential.
    Febi - Corporate Logo
    T#:56471642
    Part#: 33316792873
    Special Order: No Guaranteed ETA
    New Item
    $ 12.99 USD
    Free Shipping on orders $49 and up
    The Febi Bilstein Rear Axle Differential Mount provides factory-spec structural retention to keep your differential firmly anchored.
    Febi - Corporate Logo
    T#:382585
    Part#: 33176770866
    Special Order: No Guaranteed ETA
    $ 47.99 USD
    Free Shipping on orders $49 and up
    $ 47.99 USD
    Free Shipping on orders $49 and up