Quote:
Originally Posted by langss
I have been to a lot of wrecking yards over the years and I have never seen any square body without the insulation. True many(like the one in my truck)were thrashed and hanging down, but regardless the remains were always there. So it may have been an option, that was part of another package.... Who knows today.
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Langss, here is a link to the GM Heritage Center
https://gmheritagecenter.com/gm-heri...tion-kits.html
You can look up your model year of pickup (or any other) and can read about how the different models were equipped. It is very well documented from the time the trucks were built. No guessing, conjecture or assumptions.