rust master,
I'm in the process of building a '59 Chev 3800 (1 ton) dually 4x4 using a Duramax diesel with a 4L80E transmission and a NP-205 transfer case.
I'm using the original frame and springs. The front axle is a Dana 60 out of an '87 GMC 3500 while the rear is a Dana70 out of a '93 3500 cube van (both 4:10 gears).
I will be using the original 9' (yes, nine foot long) bed on this truck and will be widening both rear fenders to cover the dually wheels.
You can see some of my pics at
http://community.webshots.com/user/Lane9999Lane