It looks like there’s been a few mods on this CJ-3A, so some type of posi or locker seems possible.
“1951 willy 4cj5jp reg-10/31/2009 has a v6 with 1000 miles, new wheel cyl and rebuilt master. needs tires and wheels but runs with the ones on it. lights are new but need to be wired. I think it has a posi rear because 1st and second leaves great dual tire marks. thanks Jeff sell_barter@yahoo.com”