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Originally Posted by Blue_71
the 1/2 ton frames are visably thinner when you cut a section out of both and put them up together. i put 1/2 ton frame horns on my k20 and before it was welded up you could tell they were smaller, the vise grips wasnt holding the frame horns at all because it would kit my 3/4 ton frame first. that said, you should be able to put 3/4 ton axles under it and do most anything you would want to. the springs are of course stiffer on 3/4 ton too
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How about other years like the 73-87's and 88-98's? Is the metal thicker in their 3/4 ton frames too? How much?
I looked at an old C1500 (88-98) GMC at my college that was parked for years with its bed removed. I took a machinists ruler and measured the frame thickness between 0.110" and 0.135".