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This has been an on-going research project of mine. I discovered when I inquired about having the Trail Boss (TB) factory lift kit (GM part# 84629787) added to my 2019 LT Z71, that I could not have the kit installed due to the secondary composite leaf springs on my truck. Upon further investigation, I found that ONLY the LT with 5.3L (and LT with 3.0 diesel and short box) had the composite leaf springs preventing the truck from having a TB lift added. On the GMC side, I found out the Sierra Denali also uses the same leaf springs with composite secondary as the LT 5.3L.
I haven't seen anyone with official numbers. displaying the height of our trucks so I decided to pull it in the garage and measure up a couple of points. Keep in mind, this is a 2019 Trail Boss Custom, Z71, Crew Cab, Standard Bed, with ~3000miles. Everything is completely stock and the tank was 95% full. I measured the following heights; - all 4 corners(at the fender) measured at the center of the wheel - front diff (lowest point) - rear diff (lowest point) - front shroud/bumper (lowest point) I've taken the measurements twice, once SETTL