In addition to the above. For 48-54 (you didn’t specify year?)
You can easily remove and replace 1/2 ton and 3/4 ton front axles with each other because the springs are the same width and spacing. The 3/4 ton would have stiffer springs, you could also swap front springs between them if desired.

The rear part of the frame (behind cab) is vastly different between 1/2 ton and any larger truck.
1/2 ton kind of flares out wider and wider as the frame goes back.

3/4 ton and larger has parallel frame from the cab back at about 36” outside to outside.


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-