It surprised me as well?? It could very well be my wheel/combo. With the more narrow tire you are running, could make the difference. I know the Sierra and Silverado have different wheel wells and the Chevy tends to be able to run a bigger tire. There's a 19 Chevy in town that has a 4" Pro Comp lift with 35/12.5/20's that has tons of room around the tire. Set at 4" on mine, the tire would hit the corner of the front bumper. I'll try to attach a pic.