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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.
John Goreham Contributing Writer, GM-Trucks.com 6/13/2016 No story has generated as much interest lately among GM-Trucks.com readers than the GM concrete block bed test video vs. Ford. Our readers had a lot to say. A couple of those who offered comments mentioned that they could foresee composite beds like those used in the Tacoma and Ridgeline as the future choice of designers. In an attempt to jump in on the discussion, Honda has offered its own video showing the results of dumping hundreds of pounds of concrete blocks into the bed of its truck, the new 2017 Ridgeline. Unlike the For