Hy JDHolmes, I'm going to assume we're talking about a 1/2 ton. I don't have a rear axle of that vintage to measure for you, but I think it would be around 56"-60". The 55B to 59 Chev and GMC rear ends from the same size of truck would be the easiest swap. You could jack the truck up and set it on a couple of car skates or two floor jacks to load it, hope that helps.
