The 58 shop manual shows 3100 and 3200 as having the same front axle specifications (caster, camber, toe-in, etc.) and shows the 1/2 and 3/4 ton springs as being identical. I don't have any personal experience with your truck, but I'd venture an opinion that they're the same. Good luck!


1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup