Distributor is whining and vibrating, Help!!!

Take off the dist. cap and try to wiggle the shaft to see if there is any play. You should not feel much play at all, otherwise the bushing is probably worn out (I can't remember if our stock dizzy's have bushings or bearings, but you get the idea). If this continues you can and probably will experience problems (such as misfire, etc.) due to changing tollerences between the stator/rotating notched wheel and also the cap/rotor.

If there doesn't seem to be any play in the shaft, pull the dizzy and look for an abnormal wear pattern on the distributor gear, and go from there.

Hate to say it but sounds like the the dizzy is done. I had to replace two dizzys on the same stang fore the exact same reason. Good luck

when my dissy let go it did the same thing and after looking at it I realized that the rotor was hitting the underneath of the cap because the shaft had play. take a look at the underneath of the cap and see if you can see marks from the rotor hitting it. I replaced mine with an msd and its been working fine since.