Vibration!!! may the driveshaft be the cause?? (archive)

Hi, more and more about vibration, but in this case I don't think it's the famous "shimmy". The car seems to vibrate from the rear end, not the front.
Allbmwparts.com claim that e21's driveshafts get 'shot' after 100000kms, I'm not sure that's true, but I was wondering if any had this problem around...
wheels have been balanced several times, differential new, all rear trans. seems to be ok... any clues????
THANKS ALL FOR YOUR HELP!
Alex 1981 320/6

Follow Ups:

More info needed to help Paul 15:28 10/18/2000 (9)
- Re: More info needed to help Alex - 320/6 15:33 10/18/2000 (8)
  - Replace the Guibo (Flex Disc) & change rear Diff K.C.K. 11:07 10/19/2000 (0)
  - Re: More info needed to help Paul 16:05 10/18/2000 (1)
    - Re: More info needed to help Alex - 320/6 16:21 10/18/2000 (0)
  - could it be a worn out Flex disc? Austin 15:56 10/18/2000 (4)
    - What is a Flex disc? newbie question again...sorry Alex - 320/6 16:01 10/18/2000 (3)
      - Re: What is a Flex disc? newbie question again...s Paul 16:06 10/18/2000 (2)
        
        Flex disc Alex - 320/6 16:09 10/18/2000 (1)
        
        Re: Flex disc Paul 16:54 10/18/2000 (0)

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