2015 GMC SIERRA HD: Returning in its second season, the 2015 GMC Sierra 2500HD, 3500HD and Denali HD models are on display at the 107th annual Chicago Auto Show, Feb. 14-22, 2015. Each series features a fresh exterior design to reduce wind noise and enhance powertrain cooling. Sierra HD models are available in Regular Cab, Double Cab and Crew Cab, with 6-ft 6-in and 8-ft box lengths. Clever CornerStep rear bumper is standard, with textured pads that accommodate large boots. A Vortec 6.0-liter gas V-8 with variable valve timing is matched with the Hydra-Matic 6L90 six-speed automatic transmission as the standard powertrain across the Sierra HD model range. This combination is engineered to deliver 360 horsepower and 380 lb-ft of torque for all pickup models, and 322hp and 380 lb-ft in 3500HD for chassis cab models. The available 6.0L engine is a bi-fuel setup that enables it to run on compressed natural gas or gasoline. Then there is the mighty Duramax 6.6L diesel that generates 397hp and 765 lb-ft of torque, and comes linked with an Allison 1000 six-speed automatic transmission. The all-new interior is quiet and comfortable, designed to help drivers and passengers with easier-to-reach, more intuitively located controls, more storage compartments, more plug-ins for electronic devices and the latest-generation GMC IntelliLink infotainment system – with an eight-inch-diagonal color touch screen. A rear-vision camera system is standard on SLE, SLT and Denali to give the driver a view of items behind the vehicle. It can also assist with lining up in front of a trailer.
Visit the official GMC site for more information