Im pretty sure my issue is a result in a miscalculated pinion angle, and the stock driveshaft that has the rubber on the pinion end. Engine is a built 350 using stock motor mounts with a bolt through them and sealed up with 3m window weld. trans mount is a poly and actually gives more than a stock rubber from the parts store. is it the bushings that caused the issue or is it a drive line issue. don't want this to happen with the th400 I have now.