Strange Vibration
Either way I suggest the following.... have the driveshaft balanced, replace the tailhousing bushing and related seals. Then drive it and see what happens.
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Take the taihousing off, take it to a local tranny shop and they will knock a new bushing in for a few bucks, have them install a new seal also.
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Get back to us after those repairs and tell us if that took care of it or not.
Oh, be sure to check the transmission and motor mounts while you are under there. Sagging mounts can change the pinion angle slightly... it's a long shot but worth the time it takes to check 'em.
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