Sierra 3500HD is designed engineered and built to get things done. That s why our engineers created an organized driver-centric cab filled with technology to keep you comfortable capable and connected Our Never Say Never attitude has yielded a truck that s the very essence of Professional Grade confidence Sierra 3500HD. With its bold lines signature stance and premium fit and finish Sierra 3500HD is built to be as impressive as it is capable. Our engineers refused to sacrifice ride quality for capability. Sierra 3500HD s sturdy hydroformed fully boxed frame utilizes high-strength steel to increase structural rigidity resist bending twisting and shaking. This helps isolate road noise and offers smoother driving dynamics.