![]() Limited Slip Upgrades - Sadly, many BMWs today are not equipped with a limited slip (posi-traction) differential. If you can trade outright top speed for faster acceleration at daily speeds then this is the perfect upgrade for you. 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. Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more! ![]() The options are almost endless! Every custom-built diff is fully rebuilt with seals and bearings. You can purchase the ring & pinion gear sets on their own (professional installation required) or have us build a diff around your own specifcations. Our differential options vary from gearing upgrades to limited slip conversions. The engine is not the only place to make the car faster. ![]() It's easy to forget that the differential is a source for making your car faster and handle better so it's often overlooked. Upgrading various parts of the differential can have tremendous benefits in your car's performance.
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