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Can you not lift the truck by adjusting the spring stops? Might have to use stiffer springs, depending on what they ship with, but theoretically would move the compression up two inches from current.
Oh, I think I put the wrong link. :^S
Try this: https://kingshocks.com/i-30503082-25001-391-2021-chevy-tahoe-suburban-2-5-rear-shocks.html?q=