Mid-1960's Ford pickups had the front cab mounts located right behind the front wheels, directly in the spray from rain, snow, salt, etc. They were notorious for rotting out, which would cause the front of the cab to sag and put the steering shaft in a bind. The first thing to fail was usually the "rag joint" at the coupling between the shaft and the steering box. J.C. Whitney sold a replacement cab mount that resembled a big square steel box which protected the rubber mounts from splash. We would jack up the cab until it looked "eyeball level", bolt the cab mounts down, and bolt or weld the repair section into place.
The "shade tree" method was to jack up the front of the cab and support it with a length of 2 X 4 about 2 feet long between the top of the frame rails and the cab, held into place with wood screws through the cab floor!
Jerry
