All rear outputs of a 203 and 205 are 32 spline. 3/4s and of course 1 tons will have the 1350. GM no problem, but Ford is weird. I had a set of axles out of a 1 ton Ford, 60s front and rear, both yokes were 1310. I have an HP60 out of a 78 3/4 ton, and that has 1350s on it. Its a Ford thing, I don't understand. Don't even bother looking at a Dodge, they use some funky tiny joint, smaller than a 1310.