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Old 04-11-2019, 11:50 AM   #5
1976gmc20
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Join Date: May 2015
Location: Montana
Posts: 503
Re: Suburban frames 1500 vs 2500

My understanding is that K-10 and K-20 frames were the same, at least back to the early 1970s. I've had some of both though not at the same time, and the frames looked to be same thickness. I don't recall if I ever actually measured them, but there is an obvious difference in frame thickness between a C-10 and a C-20.

I was advised to just swap to 3/4 ton axles and springs to convert my Suburban to a 3/4 ton (mainly what I wanted was 16" wheels to run Load Range E tires).
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10
1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20
1977 Chevy C-10 Suburban; 1980 Chevy K-10
1989 Chevy K1500; 1991 GMC V1500 Suburban
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