Bad Flex Disc
http://www.peachparts.com/shopforum/showthread.php?p=868326

The Death of a Flex Disc ... did I kill my 240D?
http://www.peachparts.com/shopforum/showthread.php?p=2194084

What happens when you ignore that "little" driveline vibration!
http://www.peachparts.com/shopforum/showthread.php?t=205055

Flex Disc Orientation, safety and durability issue.
http://www.peachparts.com/shopforum/showthread.php?t=235575

If your W123 is shaking down the highway. . .
http://www.peachparts.com/shopforum/showthread.php?t=223050

Correct way to install front driveshaft guibo? (FLEX DISC)
http://www.peachparts.com/shopforum/showthread.php?t=187593