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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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Genuine BMW Loctite 5970 Liquid Sealant - 50ml
Genuine BMW - Corporate Logo
T#:21457
Part#: 83190404517
In Stock
23% off MSRP $29.66
$22.95
Free Shipping on orders $49 and up
23% off MSRP $29.66
$22.95
Free Shipping on orders $49 and up
This Loctite 5970 Sealant is recommended by BMW to be used to seal the rear differential cover. Also used for multiple MINI applications.
ECS Magnetic Differential Oil Drain Plug - Most BMW & Mini Models
ECS - Corporate Logo
T#:366828
Part#: 009314ECS01A
In Stock
Sale - Save 20% $40.95
$32.76
Free Shipping on orders $49 and up
Sale - Save 20% $40.95
$32.76
Free Shipping on orders $49 and up
You use a magnetic drain plug for your engine oil, right? Why not apply the same proactive thinking to the differential too? This is a direct replacement magnetic differential drain plug for your BMW. It will catch and retain fine and larger metal particles in your diff oil. If you're proactive in your diff oil servicing, you will catch a minor issue long before it becomes a headache. Diff drain plug includes one sealing o-ring. Direct replacement for Genuine BMW part number(s): 33117525064, 33110308370, 33110152626
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Turner Titanium Magnetic Differential Drain Plug - M22x1.5
Turner Motorsport - Corporate Logo
T#:593924
Part#: 027030TMS01
In Stock
Sale - Save 20% $57.95
$46.36
Free Shipping
Sale - Save 20% $57.95
$46.36
Free Shipping
When both extreme-duty protection and saving every gram matters: the Turner Magnetic Differential Drain Plug.

Complete Performance Polyurethane Differential Bushing Set - 95A
ECS - Corporate Logo
T#:589555
Part#: 026709ECS09
In Stock
Sale - Save 10% $127.95
$115.16
Free Shipping on orders $49 and up
Sale - Save 10% $127.95
$115.16
Free Shipping on orders $49 and up
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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Rear Differential Mounts - Turner Solid Aluminum - E46 M3
Turner Motorsport - Corporate Logo
T#:337
Part#: TDR4680035
In Stock
Sale - Save 20% $174.95
$139.96
Free Shipping