Cabs are all the same until you get to some good sized GMC trucks, then the cab gets bigger, but you can see the difference in those.
The fenders on 1.5 and 2 ton Chevy and GMC trucks are one size larger than the ones on 1/2, 3/4, and 1 ton. The hoods are actually smaller on the big trucks than on the smaller ones. This is because the fenders are taller, so the hood is not as tall. The grills are different too. Even though there are minor differences in the sizes of the bars, parts of the big grills can be used on the smaller trucks.
Grigg
