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I am experiencing a drive shaft vibration at about 55mph. The car seems fine at all other speeds. There is no noise from the u-joints or anything else when accelerating or braking.
You can actually feel the drive shaft (lightly) hitting the underside of the car if you place your hand on the transmission tunnel. The support bearing appears to be in good shape (tight and smooth)as do the u-joints (no play). I did replace the rubber donut for the support bearing and this seems to have made some inprovement.
I'm suspecting an out of balance drive shaft. Any ideas?
Jan 9 - Thanks for the replies, but guess what? I can't BELIEVE that I forgot to mention that I replaced both of the motor mounts and the tranny mount when I replaced the bearing donut!
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