gmdbhornet Posted September 1, 2011 Share Posted September 1, 2011 I need a little help to find out why my driveshaft is vibrating. The drivesahft was removed when I had the transmission removed and resealed. Now it vibrates at 75 mph and when I let off the gas it vibrates at 55 mph. Any help with this would be appreciated. Thanks Gerry Link to comment Share on other sites More sharing options...
60FlatTop Posted September 2, 2011 Share Posted September 2, 2011 Look for some punch marks in the circumference of the rear flange where it bolts to the rear end. Some one may have marked it in the past if the new service did not index it.Second, lightly loosen all the engine and transmission mounts bolts. Start the car and let it run a bit and tighten. Sometimes guys put stress on the parts during assembly.Bernie Link to comment Share on other sites More sharing options...
1965rivgs Posted September 2, 2011 Share Posted September 2, 2011 Check to be sure the center bearing bolts and rear flange bolts are tight. Also, the rear flange is a tight fit on the diff yoke. Be sure it is not cocked.Tom Mooney Link to comment Share on other sites More sharing options...
Guest kaycee Posted September 9, 2011 Share Posted September 9, 2011 On one of the '65's I owned, I had to replace all the u- joints. That may be your problem. It may be one or more of them. Good luck, and keep us posted. kaycee Link to comment Share on other sites More sharing options...
Guest Kingoftheroad Posted September 9, 2011 Share Posted September 9, 2011 A friend had the same problem with his 68 Buick, his drive shaft just need to be rebalanced and it was fine. Link to comment Share on other sites More sharing options...
NTX5467 Posted September 10, 2011 Share Posted September 10, 2011 If this is a two-piece driveshaft, there might have been some shims between the carrier bearing and the frame that were lost? Might need to get the factory service manual, a magnetic circular level, and check the angularity of each shaft with the car at "ride height".The integrity of the rubber in the center bearing might have been compromised, OR was about to be compromised before the work was done, due to age and other factors. U-joint issues (including the special "double-jointed" situation) might also be involved.Just some thoughts,NTX5467 Link to comment Share on other sites More sharing options...
RivNut Posted September 10, 2011 Share Posted September 10, 2011 On another forum recently, a guy was having the same type problem. After putting it on a rack and simulating the road speeds at which he was having the problem, he found out that he had a bent rim that had a harmonic balance problem at those particular road speeds. Ed Link to comment Share on other sites More sharing options...
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