What if I feel a wobble in my driveline? What causes this?The wobble is likely caused by the failed support, not the bearing. In either case, both can be replaced without removing the center u-joint. If the center u-joint has failed, then your best bet is to find a used shaft that needs CV's, etc., but has a good center u-joint (more common than you think).
I think you are confusing the bearing from the support. The "support" is the rubber bushing and metal bracket that supports the bearing, and you can modify a BMW part. You can replace the bearing with any number of configurations, but I decided to talk to the horse itself - FAG Bearings.
The OE FAG bearing is p/n 639850.R20.28, and is made in Germany, but is NLA.
I tore down my prop shaft last summer, the night before a track event. I replaced the center bearing with a FAG unit from New Hampshire Ball Bearings ( Tel: 603-924-4100). The OE bearing uses a polyamide cage, which is NLA - FAG presently only makes a bearing for this application with a steel cage. The bearing cost me no more than $14-18. FAG p/n 6006.2RSR.C3. This replacement bearing is made in Korea.
You'll need a 12-point torx socket to yank the prop shaft (T-55?) I can't remember the exact size, but I bought a cheap 8-piece set at Autozone, and it had the correct size.
As far as I know, the u-joint is specific to Audi. on the cars with carbon fibre shafts, this non-serviceable joint was "staked" into the cradle - there is no bolt-on "strap" or cir-clip to center and lock the u-joint into the cradle. A former lister mfg'd a jig to cut out the stake marks, remove the joint, replace and restake, all the while ensuring that the joint was properly aligned in the cradle, but he is no longer doing work on Audi's.
Your best bet is to find a used prop shaft - ask around on the list, or try the usual suspects.
