Here's all I know. I put a mid 70's C20 (3/4 ton) box in my 64 C10 and the steering ratio was almost too tight. It would react to any little movement of the steering wheel. The truck I got it from had the large split rim wheels on it so it must of had the closer ratio than the smaller trucks. Once I got used to it, I liked it,
Scott


Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!