Chevy parts book shows the rear hubs 3/4 and 1 ton the same from 46-59 with either single or dual wheels.
The front brake drum for the 1-ton w/duals is unique for the years 47-52. Might be hard to find.
I'm in the process of converting a '55 second series GMC 3/4 ton from singles to duals. I'm also adding disk brakes to the front, new single piece 16" rims, and a 14 bolt rear-axle from an '87 flatbed truck.
\'55 GMC Dual Wheel conversion.
