Driveline vibes.

My vibes start at 45mph and above although I have reduced them by adding a hose clamps and moving them along the shaft. I am not finished yet, but I was wondering if there are anymore "old school" tricks. I've replaced both U joints, and the car has the pumpkin that came in it but the hogs head is different. I was wondering if pinion angle might have something to do w/ it. I had a Falcon that had a similar problem and all I did was shim up the diff, under the front side of the spring pad to fix it. The 'Stangr has been in my family since 1983 and I don't ever remember it having the vibes.

Rapid: Good point I will check it out in a different gear.

D.Hearne: Is your Comet a six? I had a Maverick that had a vibe but I was told that the Ford sixes of that era had an inherent vibe to them. The quality control in that era was at its worst.
I had the same vibes w/ two different hogs heads. The one in there now was rebuilt in the mid 80s but hasn't been run since 93. The driveshaft is the one that came w/ the car. The same for the slip yoke an it doesn't seem to have any noticeable wear that would cause vibes. If its tranny bushing wear I'm not going to worry about it as I will be removing the C4 and re-installing the 4 speed. But I will check out the busing in the 4 speed. It doesn't seem to be too hard of a job to replace the bushing. Getting it out is another matter. I wonder if any of the auto parts stores rent such a tool.