THE PROBLEM
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.
The first video below was recorded on an Audi, but BMW (and everyone else???s) OEM carrier design is similar. The shaft is not well-supported by the soft OEM carrier, so it???s allowed to travel off-center during rapid loading and unloading. The second video is a BMW carrier showing a comparison of how much the OEM carrier gives under load and the improvement with the JXB carrier.
THE SOLUTION
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.
THE BUSHINGS
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
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. The video below was made on a 3-series. The exact steps to access the carrier will vary slightly by model, but the removal and installation of the new carrier are 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 if needed for access
Remove heat shielding covering center support bearing
Cut off OEM carrier and remove rubber support material with razorblade, leaving base layer of rubber intact on the bearing
Clamp new carrier around OEM bearing
FITMENT
G20 7th gen 3 Series (Saloon)
G21 7th gen 3 Series (Touring)
G22 2nd gen 4 Series (Coupe)
G23 2nd gen 4 Series (Convertible)
F90 7th gen M5
G30 7th gen 5 Series (Sedan)
G31 7th gen 5 Series (Touring)< /p>
G32 4e generatie 6-serie (Gran Turismo)
G38 7e generatie 5-serie (LWB)
G01 3rd gen X3, all models including F97 X3 M
G02 2nd gen X4, all models including F98 X4 M
Part Numbers (26 12 8 686 120, 26 11 8 488 056, 26 11 8 671 495, 26 11 8 488 057)
Full Assemblies
Street - BMW13A0-S
Track - BMW13A0-T
Both - BMW13A0-B
Spare Bushing Packs
Street - BSH04A0
Track - BSH04A1
