If you are serious about making it four-wheel-drive you might want to start by looking for a front axle. The gear ratio front and rear has to be the same, so you don't want a rear you can't easily match to the front.
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...