Jim, not sure what year truck you are referring to. If you check the Tech section of the site you will find a Truck Specification file or link. Then you will be able to see the specs for the truck you are considering for.

I checked for my 59 one ton, and the rear axle seems to be the same specs, whether dual or single wheel. Hope that helps.

~ Victor
1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery
1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD
1957 3100 - moved on
1959 C4500 Short Bus "Magic Bus" - moved on
1959 G3800 1 Ton Dually "Chief" - moved on
1958 C4400 Viking "Thor" ~ moved on to fellow Bolter