1988-2007 GM/Chevy 1500 (Classic) 4WD. Also fits Cadillac Escalade, Chevy Avalanche, Tahoe and Suburban, and GMC Yukon and XL. Front 2.5" Leveling Kit. PN RTX99300. The RTX Off Road GM 1500 2.5 inch Torsion Key. Leveling Kit will lift the front of your 1988-2007 Chevy Silverado 1500 4WD pickup and SUVto allow for larger wheels and tires. Provides a leveled stance. Includes CNC machined lower shock mount extensions and hardware.