I did the exact same setup on my 2019 LTZ 4wd. I confirmed with the company that the lift blocks where flat (not tampered) and that I needed to leave the factory shims in place. Everything went in just fine and I love the look now. I have a 2.5" eibach lift in the front and now a 1.5" block in the rear. I measured out at the front of 40" and the rear is 40.5" so just a little rake.