Professional Grade Engineering
Quieter, stronger, more aerodynamic
GMC engineers took an all-encompassing approach to quietness for the 2014 Sierra. The truck features new aerodynamic measures that benefit fuel efficiency and reduce wind noise. Updated mirrors that reduce wind turbulence, triple-sealed inlaid doors, as well as roof and tailgate design features all help air flow smoothly quietly over the Sierra. Additional sealing around the grille, headlights and space between the cab and box are also designed to lower drag for the new trucks, along with new aerodynamic spats located in front of the rear wheels
Updates to Sierra’s body and chassis are designed to improve ride and handling, comfort and capability. The fully boxed frame uses high-strength steel and hydroforming to provide more strength and rigidity with less weight. New cab structures incorporate high-strength steel in the A-pillars, B-pillars, roof rails and rocker panels, while ultra-high-strength steel segments of the rocker panels provide added protection for shallow offset crashes.
Sierra’s hood is aluminum, saving approximately 17 pounds versus a comparable steel hood. At the rear, a roll-formed box is stronger, lighter and more durable than a traditional stamped steel box.
Sierra uses aluminum for some suspension components for additional rigidity and weight saving, and new lightweight wheels are paired with low-rolling-resistance tires in most applications. The tires, along with new shear-style and redesigned hydraulic cab mounts, are designed to help reduce noise and vibration in the cabin.
"Pickups aren’t just a tool for GMC owners – they’re part of their everyday lives, and Sierra needs to be as useful on the way to the movies as it is on the way to a job site. The most important thing about the engineering behind this new truck is that it benefits owners in so many different ways."
Tony DiSalle, vice president of GMC Marketing
Duralife brake rotors and electric power steering
Strong brakes are important for stopping trucks, whether they’re full of people, payload or both. The 2014 Sierra features four-wheel disc brakes with Duralife brake rotors, which feature a hardened and strengthened surface to reduce corrosion. Duralife rotors – a GM-exclusive technology – are expected to last twice as long as conventional rotors and provide quieter braking with less vibration.
The 2014 Sierra also uses electric power steering. An electric motor in place of an engine-driven hydraulic pump saves fuel and allows for tuning that’s expected to result in a more consistent, crisp steering feel and plenty of assist for parking maneuvers.