2011-2019 GM 2500/3500 2WD/4WD 8-lug. 2.25" Torsion Key Leveling Kit. 2011-2019 Silverado/Sierra 2500HD/3500HD 2 & 4WD. Front 2.25" Leveling Kit. PN RTX99302. The RTX Off Road Chevy Silverado 2500/3500 HD 8-lug 2.25 inch Torsion Key Leveling Kit will lift the front of your 2011-UP Chevy Silverado 2500/3500 HD 8-lug 2WD & 4WD pickup to allow for larger wheels and tires. Provides a leveled stance. Includes shock mount extension spacers. RTX Off Road Torsion Key Leveling Kit. Shock extensions included. Safely raises trucks 2.25 inches. Easy Installation.