TheÂ Cognito 110-90768 2" Performance Leveling Kit gives you everything you need to level the front of your 2011-2019 GM 2500HD/3500HD 2WD/4WD in a single box! Included in this kit are a set of Cognito Ball Joint SM Series Upper Control Arms, Torsion Bar Adjuster Keys, Front Shock Extensions, and a Cognito Sticker Pack. By packaging all these components together, Cognito can offer them at a lower price versus purchasing them individually. So give your truck a more aggressive look with the Cognito 2" Performance Leveling Kit! Features: 2" Leveling Kit Bundled Discount Includes Upper Control Arms, Torsion Keys, & Shock Extensions Fitment Note: Wheel width should be kept at 9â€ or less with 5â€-5.75â€ backspacing. Tire width should be kept at 11.5â€ or less, and diameter kept to 33â€ or less, to avoid rubbing while turning. With wider than stock wheels and tires, trimming will still be required to the back bottom of the fender well area and the plastic valance under the front bumper.