Re: Vibration

Posted by HH56 On 2014/8/28 20:32:37

If you rule out obvious things, Packard issued a service bulletin (56-T10 corrected) because of problems with vibration on 55 and 56 seniors. Their problem was at a higher speed -- around 60 -- because of the U joint angle. Their fix was minimal so It didn't take but a very little amount of angle being off to cause that problem. Wonder if there is any chance something has loosened or a worn bushing at the rear axle or torque arm mounts on your car is causing the driveshaft/rear axle angle to change up/down or side to side and vibration is manifesting at a lower speed.