Im looking for a complete 1965 F600 cab with little or no rust, Im from a northern climate and road salt has taken its toll on this one.

A friend of mine gave my a 1965 Ford medium duty grain truck it has a noise in the rear end the code for the axle is F8E anyone know what type it is. Its a 2 speed and will probably have to tear it down Im looking for illustrations and direction. This clunk seems to come about every 5 or 6 turns...