The ReadyLift 1.5" leveling kit for the GMC Sierra Denali and High Country 1500 models is designed to work with the Adaptive Ride Control. The ReadyLift engineers added an important repositioning bracket that mounts to the upper control arm to eliminate the new leveled stance from compromising the Adaptive Ride Control suspension performance. Upper strut spacers made using CNC machined, aircraft-grade Billet aluminum are designed to work exclusively with the struts.Kit ComponentsCNC machined 6061-T6 billet Aluminum upper strut extensionsLonger installation bolts and nutsNew brackets for ARC arm mounting point on the control armAllows the following tire/wheel comboMaximum tire size of 33x11.50-20 on 20x9 0 offset. Some minor trimming may be necessary depending on tire tread designSome wheels may require 6mm or greater wheel spacer to clear the brake caliper