If it has a 1-ton rear its already been converted to at least partial open drive. The fully closed drive line was only used on 1/2-ton trucks.

I know the 3/4-tons had a funny half-closed, half-open setup. I think the 1-ton were completely open but I don't recall ever crawling under a '48 to be sure exactly what it was.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...