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BMW Differential and Gearing Upgrades for BMW 4 Series F32 (2014+)

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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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Driveshaft Seal

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:362306

Part#: 31507609535

In Stock

12% off MSRP $ 18.20

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

$ 15.95 USD

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12% off MSRP

$ 18.20

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

$ 15.95 USD

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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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$ 17.99 USD

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Seals the input shaft flange to the front differential

OEM Elring Rear Differential Axle Shaft Seal - BMW F3X G2X G8X & More...

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T#:53008820

Part#: 33108860348

In Stock at Vendor

$ 44.99

This product was last offered at the strikethrough price on
05-08-2026

$ 43.99 USD

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$ 43.99 USD

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The Axle Shaft Seal is a critical component designed to prevent fluid leaks around the axle shaft, ensuring the proper function of the vehicle’s drivetrain system. This seal helps maintain the integrity of the differential, preventing dirt, water, or contaminants from entering the diff while keeping lubricants contained.

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Front Differential Input Shaft Seal

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:485407

Part#: 31527507697

Ships in 1-2 days

7% off MSRP $ 13.99

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

$ 12.99 USD

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7% off MSRP

$ 13.99

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

$ 12.99 USD

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Seals the input shaft flange to the front differential

Genuine BMW Lock Ring - 27107539525

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:53816

Part#: 27107539525

Ships in 1-2 days

6% off MSRP $ 16.99

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

$ 16.00 USD

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6% off MSRP

$ 16.99

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

$ 16.00 USD

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Replace these when reassembling the transfer case. Genuine BMW Lock Ring - 28X2 This item fits the following BMW Chassis: E70 X5M,E71 X6M,E53 48IS,E53 X5,E70 X5,E71 X6,E83 X3,E90,E92,F01,F02,F06,F10,F12,F13,F15,F16,F25 X3,F26 X4 X4,F30,F31,F32,F33,F34,F36

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REAR-AXLE-DRIVE

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T#:6699706

Part#: 33108485723

Ships in 1-2 days

4% off MSRP $ 3,335.99

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

$ 3,185.99 USD

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4% off MSRP

$ 3,335.99

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

$ 3,185.99 USD

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Genuine BMW Differential - F3x

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T#:226178

Part#: 33107603747

Ships in 4 Business Days

4% off MSRP $ 2,951.99

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

$ 2,819.99 USD

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4% off MSRP

$ 2,951.99

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

$ 2,819.99 USD

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TRANSMISSION COVER

For Vehicles Equipped With a Manual Transmission For Vehicles With a Production Date up to 03/2014

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T#:572386

Part#: 33117589964

Ships in 7 Business Days

5% off MSRP $ 176.99

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

$ 168.99 USD

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5% off MSRP

$ 176.99

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

$ 168.99 USD

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Genuine BMW Transmission, Differential, & Transfer Case Service Kit -...

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T#:39126859

Part#: F3XDIFFXDRSRVKT

Ships in 9 Business Days

$ 781.99 USD

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$ 781.99 USD

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BMW manual transmissions, differentials, and transfer cases require specific fluids to maintain optimal performance and prevent excessive wear on internal components like gears and bearings. While these fluids don’t endure high temperatures like engine oil, they still degrade over time and accumulate metal particles and other contaminants, leading to reduced lubrication and accelerated wear. This can ultimately shorten the lifespan of your transmission, differentials, and transfer case. This kit includes all the essential Genuine BMW fluids and drain plugs needed for your vehicle, along with specialized tools to simplify the maintenance process!

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Front Differential Input Seal Kit - E46, E53, E60, E61, F30

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:41289766

Part#: 31521428678TKT

Back Ordered

$ 52.99

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

$ 50.99 USD

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$ 50.99 USD

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This kit comes with the seal and both dust covers needed to re-seal your vehicles input shaft on the front differential.

Shaft Seal with Lock Ring - Differential Output Shaft (43 X 90 X 10 m...

For vehicles with production date up to 02/14

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:599651

Part#: 33107564416

Ships in 1 Business Day

$ 17.99 USD

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$ 17.99 USD

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This item fits the following BMW Chassis: E70 X5,E89 Z4,F01,F02,F06,F10,F12,F13,F15,F16,F22,F25 X3,F26 X4,F30,F31,F32,F33,F34,F36

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