Spy Shots—2017 GMC Sierra Denali 3500 HD Duramax Source: SEMA This is the ’17 GMC Sierra Denali HD 3500 caught testing in the Rockies. The HD trucks will adopt a look similar to the ones introduced on the 1500s for 2016, complete with a taller and bolder front end and a new hood scoop that reveals the pickup is equipped with the latest version of the current 6.6L V8 turbodiesel. It will be comprehensively modified to unseat the Ford Super Duty in efficiency and hauling capacities, pushing it comfortably over the 425 hp mark, and at least 860 lb.-ft. of torque. An eight-speed automatic transmission is also likely to become standard, but the 10-speed unit may not be far behind. The revised HD trucks are supposed to last until 2020 or so, when the next-generation GM pickups will adopt a more aluminum-intensive architecture to reduce weight, also carrying downsized engines for better efficiency. Expect to see the ’17 Sierra HD by the summer.
