the swap
Howdy Russell, long time no chat!
The first gen trucks are an easy swap once components are found. The only real hassle is welding in the rear shackle mounts for the front leaf springs.
Since you want to convert your nice second gen to 6x6, this may be tricky. BUT... I believe you have a cab/chassis truck, so you already have a solid front axle, correct? If so, this will greatly speed up the process. You just need the driveline to bolt in, some guts to tear a hole in the floor for the shifter, a crossmember, and you are in business. There are the little hassles, like vacuum plumbing and wiring harnesses, speedo calibration, transfer case clearance, and a few more that you won't realize until midnight of the day before you need the truck. Also, don't forget that a safe and sane working environment must be present.
The hardest conversion I ever did was making an 81 Chevy C10 2wd 6. 2L diesel auto into an 81 K10 305 gasser 4 spd 4x4. EVERYTHING had to be redone. Another point to remember (that few people are aware of), federal laws state that the title goes with the frame, so swapping a body/frame will techincally require a DMV officer to inspect and assign a new VIN number to your rig to correspond to the "new" 4x4. Don't forget to have a paper trail present for both trucks.
Weigh the costs before diving in. Check out everything in advance. I would say that if you don't have a proper facility or don't have the parts laying in your own backyard, then the swap will cost more money than it is worth. But then, when does a gearhead ever pay attention to all the costs when a project has presented itself?
