I have a 52, 61, 64, and 70 1 ton DRW trucks and only the 70 will take 16's. All the others require at least 17-18 inch wheels to clear the brakes on the inside rear. Here is a quote from BarryGMC in the parts wanted section on this site:
Parts wanted thread I have a 50 and a 65 both with ho72 rears and stock brakes. Both run one piece dual 16 inch wheels. I use the same wheels on my 99 dually 4x4 and it has much larger brakes. Barry.
Does anybody else have any of these early 1 ton duallys that will take 16" wheels on the inside rear with the factory rear brakes? Is there any with smaller brakes? I thought the all came with the same size brakes?