[OrrieG]

The link in my signature will drop you on a 1956 truck spec page with frame information. Look thru the specs to compare the 6100 frame and running gear information to what you want to put it into.

Short answer off my head is engine and trans should bolt up. The rear end will have a much lower ratio (like 4:56 or 5:11) than is usually not suitable for every day highway use, the big trucks were designed for hauling heavy loads at relatively low speeds. I believe the spring pad locations are all the same but you can check in the specs to see. At one time I had a sm460 and 1 ton rearend in mine when it was 2wd. Great for climbing in the mountains where I camped and hunted, but getting there was a 45 mph trip with the 4:56 rear end. There have been other threads on finding higher gear sets but consensus seems to be they are rare, expensive and newer modern rear ends are cheaper and relatively available.