Austin:

Drive shaft mount or flex disk? Either could b bad. Check the mount by shaking the drive shaft -- if you can move it in the mount, the rubber is bad.

The flex disk goes between the driveshaft and the transmission (or diff, but that one rarely goes bad) -- and signs of distortion or cracking means replace it, the drive shaft can come loose if the centering sleeve goes , too.

If the flex disk is bad and you have thumping noises while driving, get a new centering sleeve, too, it will be broken and allow the driveshaft to move too much. Get the grease that goes in it, too!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!