Cognito Economy Leveling Kit for 01-10 Silverado/Sierra 2500/3500 2WD/4WDThis kit consists of torsion bar keys and shock extenders to be used with OE or OE length shocks. Each Kit Features: Yields 2 Inches of front lift Forged steel torsion bar adjuster keys 1 2 Inch Extenders for OEM front shocks Uses OEM upper control arms Improves vehicle look and reduces factory nose down rake Maintains adequate droop travel to retain ride quality Fits up to 33 x 11. 5 Inch tire, 9 inch wide wheel with 5 Inch back space 2 hour DIY