Sierra, silverado. Without enhanced towing pkg. 4wd, 34mm. 2wd, 34mm. Exc.Increased Capacity Suspension. Helps keep your vehicle's body level during cornering or maneuvering GM Genuine suspension parts match the GM vehicles original equipment in ride, handling and stopping distance GM Genuine suspension components are specifically designed and engineered to work together with the GM vehicle ABS braking and stability systems Go through hundreds of validation / durability tests that include mechanical, climatic, material, enclosure and electrical testing Tested to rigorous GM standards for, durability, performance, temperature cycling, corrosion and fatigue Aggressive environmental wear testing includes heavy loads, water, salt, bumpy and dirty roads Tested extensively in GM vehicle applications to specific engineering requirements This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Sierra, silverado. Without enhanced towing pkg. 4wd, 34mm. 2wd, 34mm. Exc.Increased Capacity Suspension. Helps keep your vehicle's body level during cornering or maneuvering GM Genuine suspension parts match the GM vehicles original equipment in ride, handling and stopping distance GM Genuine suspension components are specifically designed and engineered to work together with the GM vehicle ABS braking and stability systems Go through hundreds of validation / durability tests that include mechanical, climatic, material, enclosure and electrical testing Tested to rigorous GM standards for, durability, performance, temperature cycling, corrosion and fatigue Aggressive environmental wear testing includes heavy loads, water, salt, bumpy and dirty roads Tested extensively in GM vehicle applications to specific engineering requirements This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors