When I ran a Diesel repair shop and road service, I encountered more than one twisted driveshaft, the result of a driver getting a little too energetic trying to get a heavy load moving. Rev the engine up and dump the clutch in Granny gear, and something's going to move, bend, or strip out. These old rigs got used and abused a lot before most of us acquired them, so anything is possible. I've got the remains of a 51 GMC running gear that might have the same intermediate shaft, if it would interchange with your assembly. I have no use for it, as I acquired the bare frame and part of the running gear in a swap. Got any pictures available? If so, drop me an email.
Jerry
