As another option, I have a 63" propeller shaft that could be shortened 3" by a driveshaft shop. It came from a 48 GMC so we would need to confirm diameters, teeth, etc. Just a thought.
1947.2 GMC 1/2T SWB panel 1947.2 GMC 1/2T long bed 1948 GMC 1/2T short bed