Torsion Key Leveling Kit by Trimmline / Cognito will give you the adjustment if needed to help level out your 2001-2010 Chevrolet / GMC 1500HD, 2500, 2500HD, 3500, 3500HD 8lug vehicle. Silverado, Sierra, Avalanche 2500, Suburban 2500, Yukon XL 2500. Trimmline torsion bar adjuster keys by Cognito Motorsports are forged for strength. Also included in this package is a pair of lower shock extension brackets which convert your shocks to the correct length needed for use with an aftermarket torsion bar adjuster key. The perfect upgrade to eliminate the factory nose low stance of your GM 8lug vehicle or to clear a larger tire size than factory.