The common swap for the AD 1 Tons is a pumpkin from 68 to 72 with a 4:10 ratio. The 1948 1 Ton would have come from the factory with a 5:14 ratio rearend. I did the swap on my 51 1 Ton and I amd happy with it.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!