Ted,
What you have is a NAPCO conversion which was the name of the company that converted the 2wd chassis to a 4wd.You can use any front and rear axle from 1970-1987 1/2 ton or 3/4 just make sure you have the same gear ratio.The front axle bolts right in but the rear will require moving the spring perches in 1/2 " on each side.You will also have to add dual resevoir master cyinder to accomodate the disc brakes.The stock "62" axles are okay but they have a tendency to break the left side directly above the axle vent.Don't ask me why but I have seen two others including mine which broke twice before I converted.Any other questions drop me a PM
