Anything 3/4 or 1 Ton from 1946 through 1972 are "Carrier Swappable".
In order to use the aftermarket ring and pinion sets that were available until recently, you needed a 67-72 carrier, as they are slightly different -- and several were available for the manufacturers to test with. Just swapping in a newer carrier with stock gears should be fine.
If I'm wrong someone will come along an correct me.
