Thanks for the info and pics, Ed! I know about the P30, but I already have the 1988 C6000 (also a 2 ton) and was wondering specifically about that.
If I used the whole front axle, the tires would be a tad wider (maybe an inch on each side) than the fenders on my 58 2 ton, and the 55.2 fenders are not quite as wide so, they'd stick out too far.
I need to take some measurements on axle thickness and kingpins and see! I'd like to use both front spindles and the rear axle off the C6000 so I have disks all the way around and the same bolt pattern!