Thanks for the info on the cab and the kingpins. I haven't actually looked at the brakes closely yet, but I will see. I don't remember anything that would have made me think it had disks up front, but you can never tell.
As far as that rear end, where is a good site to look up the numbers on it? I'd like to see if it is an original or if I can tell anything about it by what the numbers show it *should* be.