Description: All models. 1/2 ton. 2wd, 1/2 ton. With crew cab. Without spring special pkg.. Vacuum booster system. With 7,200 gvwr. Supports the vehicle while allowing the wheel to rotate Maximum lateral stiffness for optimum ride, handling, and driving dynamics GM OE parts are built to help withstand potholes and designed to maximize seal life GM OE bearing designs are dimensionally optimized to work with their mating parts Manufactured to GM OE specification for fit, form, and function