just reinstalled the tranny in my 89. its a used tranny, i didnt take off the clutch or flywheel and now there is vibrations when i accelerate and at rpms above 3gs. i have a feelin it may be the universal joints on the driveshaft or the driveshaft has 8 bolt holes and the rearend only has 4 to connect it to could it be off a hole?
thanks gary

 

What did the tranny come out of? Could be a loose input shaft/pilot bearing.