Product Questions & Answers
Product Questions & Answers
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The stock center support bearing carrier holds the driveshaft in place with rubber so thin about 20 lbs of force moves it from center to the end of its travel. While that’s great for making sure no NVH makes it to the cabin, it doesn’t keep the bearing centered well under load, allows the bearing to sag over time and ruin the driveshaft alignment, and creates slop in the driveline during shifts and throttle application. Over time the OEM bushing sags and becomes brittle, eventually dry rotting and cracking. Even on the best-kept cars, the stock bushing can start to form cracks in as little as 5-10 years. When the bushing lets go, it can lead to excessive vibration and clunking and puts more stress on the bearing. To make matters worse, the stock carrier is molded onto the center support bearing, so it’s not easy to replace without special tools.
This upgraded unit keeps the driveshaft firmly in place at all times, and its solid construction ensures it will never wear out. The thick bushings ensure the driveshaft cannot move from center, maintaining driveshaft alignment at all times.
Two options are available for the bushings, both of which are many times over better than the stock bushing. We’ve paid close attention to the NVH levels associated with this upgrade. After extensive design iterations, we’ve come up with custom isolator bushings that separate the carrier from the body of the vehicle and mounting hardware. These carriers substantially reduce NVH levels.
The street bushings absorb most of the NVH from the drivetrain. Some light NVH is possible at some speeds in the form of a soft hum. With a modified exhaust or windows down you’ll probably never hear it.
The track bushings are for those who want no-compromise drivetrain performance. These may create a substantial amount of cabin noise. Not sure which is for you? They’re interchangeable so you can try them both.
Installation doesn’t require removal of the driveshaft. The 2-part design clamps around the OEM bearing. The old carrier must be removed, so a cutting tool is required. Below is the installation of this part on an E65 Alpina B7. The exact steps to access the carrier will vary slightly by model, but the removal and installation of the new carrier is the same. The basic steps are:
Remove any braces or splash shields preventing exhaust and heat shield removal
Remove or lower exhaust in area of center support bearing
Remove heat shielding covering center support bearing
Cut off OEM carrier and remove center rubber rib with razorblade, leaving base layer of rubber intact
Clamp new carrier around OEM bearing
- Available bushing stiffness: Street (Softer, Quieter), Track (Harder, Louder), or Both!
- JXB Performance Driveshaft Carrier
|E65 745i 4.4L V8 [N62]|
|E65 750i 4.8L V8 [N62]|
|E65 750i 6.0L V12 [N73]|
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