[Dion Hildebrandt]

I fought something like this awhile ago, I kept destroying driveshafts and transmission cases.
Long story short the original driveshaft skip roped and one thing went undiagnosed through all repairs.....the transmission crossmember got bent downwards. The third instance we went and measured driveline angles and reset them back into a favorable set of angles. FWIW just my 2 cents