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The driver is telling me that our car has a pretty bad vibration when letting off the gas for a caution or at the flag. The car is a 6 year old Shaw that seems to be working pretty good, other than that. We've replaced the top shock, replaced the pull bar bushings, have the pinion angle at only 6 1/2 degrees. The u joints seem to be fine, so we didn't replace them. Any suggestions on this would be greatly appreciated.
Possible Drive Shaft, Or Transmission Output Shaft?
sounds internal trans to me. maybe the front cage bearing on the output shaft
If it is a standard slip yoke transmission. You may try putting a new bushing and seal in it. Also how much yoke is in the transmission?
Drive yoke, driveshaft joints, pinion bearings is what I would start with.
what about tightening up deceleration bushing on pullbar, or replacing it with a harder one?
Thanks for all of your replies to this. Well, we changed both u-joints in the driveshaft, put a new bushing in the Brinn tranny, and still had the problem. We then changed the complete driveshaft and the problem went away. Again, thanks for the help.