Rockauto does not list a rebuilt unit for '48 GMC, but they list one for '48 Chevrolet truck. I think GMC & Chevrolet used the same steering gear?
Yes they are the same. As long as it's a 1/2 ton.
I just checked RockAuto. They have a rebuild service for the steering box. But my main shaft broke in half. So I need to start with a whole used column and box to use and/or rebuild.
I may have one lined up, waiting to hear back from the guy.
Thanks tclederman.