You should be looking for GM King Pin kit #601019 for 1931-42 Utility, 1946-50 3/4, 1, 1 1/2 ton and 1951-52 3/4 and 1 ton. This is with a relatively few model exceptions.

Or, the new part number/interchange is NCP 2621161.

Napa w/details

Hope that helps.

Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton