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BMW Drivetrain Parts

Drivetrain

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.

Turner Short Shift Kits

Turner's Short Shifter Kit line provides comprehensive coverage for manual BMWs. These are double adjustable short throw shifters, allowing you to fine tune throw and height to your specific preference. Also featuring our quick change rally lever extensions!

This category contains parts that fit the following chassis:

Axle Shafts

We offer front and rear axle shafts for your BMW. BMW all wheel drive models front axle shafts are common failure items. We recommend inspecting the rubber boots regularly as a preventative measure. If the CV joints of the axle shaft are exposed to water and dirt they are very likely to fail prematurely.

B&M Short Shifters

B&M is all about transmissions. They are among the largest and most advanced performance transmission builders in the world, specializing in mainly drag racing and muscle cars. It's their expertise with heavy-duty drag racing environments that allows them to build precision engineered and long lasting shift kits. Since the early 1950s, B&M has been at the forefront of transmission and shifting technology. They use advanced CAD equipment to design complete shift lever upgrades and their BMW kits are some of our best-selling short shift kits. B&M Short Shifters are a complete redesign of the stock lever in stainless steel and aluminum and includes a new sealed lower bearing cup that requires no maintenance. Some models are also height and throw adjustable. B&M packs a high level of features into an economical package.

This category contains parts that fit the following chassis:

Clutch Parts

The OEM clutch kits that we sell include the basic clutch components - disc, pressure plate, and throw-out bearing. But there's much more to the clutch and driveline system than that. These are all of the 'while you're in there...' parts that make sense to install or replace at the same time you have the transmission out of the car. In this section you will find: hardware, clutch fork, dowels, ball pin, spring clip, hydraulic lines, clutch master cylinder, clutch slave cylinder, output cylinder, flywheel, SMG hydraulic pump, pressure accumulator, and other clutch-related parts.

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.

Differential Mounts and Upgrades

Rubber mounts are used to locate the differential to the subframe in RWD BMWs. This is one area that we like to focus on to improve power transfer, response time, and the overall feel of the drivetrain. By using a stiffer bushing you reduce or eliminate the 'wind up' and deflection of the stock rubber differential mounts when power is applied. A solid bushing will not twist when power (torque) is applied. Instead that power is directed to the drive wheels where it will do the most good. Our diff mount upgrades are solid rubber, Delrin, or aluminum kits depending on the application and the intended use. Even though these were developed for our race cars, we put them in a lot of street cars as well. The diff is not directly linked to the wheel and suspension so these are not as affected by bumps and road imperfections. Some additional drivetrain vibration may be felt through the chassis but in our experience it's very minimal. When installing one of our performance differentials make sure you also replace the mounts! And any subframe overhaul should also include solid diff mounts. There's no downside!

Driveshafts

Got a vibration through the driveline on your BMW? Did you know that the u-joints are not replaceable on a factory driveshaft? Our remanufactured driveshafts allow for future replacement of u-joints and are rebuilt to a higher specification than the factory driveshaft. We start with OEM u-joints and then machine yokes onto the driveshaft to allow for future u-joint replacement. All bushings, universal joints, center bearings are replaced with new hardware (flex discs are not included but available separately). The whole unit is then dynamically balanced on a precision Axiline Balancer.

Driveshaft Center Support Bearings

A worn-out center support bearing can lead to some annoying side-effects. The driveshaft on BMWs is broken up into 2 sections. The center support bearing is where the 2 sections meet. It consists of a metal bearing in the middle that is surrounded by vibration-absorbing rubber. As the vehicle ages the rubber becomes weak and rips away from the bearing. The result is a vibration and a bad thumping or knocking sound.