Cognito 20-25 Chevrolet Silverado 2500 HD3in Performance Leveling KitFront and rear Cognito 2. 0 IFP aluminum shocks, rebuildable and tuned specifically for these trucks providing on road comfort and control with the ability to venture off road more confidently. Proper length front shocks to maximize suspension travel without binding tie rods, lower ball joints, and cv axles (front suspension droop limiter is the front shock). The specific length of front shock used adds 35% more travel (down droop travel). To provide