Spy Shots—2017 Sierra/Silverado 3500 HD Dually Source: SEMA These shots of the '17 Sierra and Silverado 3500 HD Dually were snapped while the truck was on a test run in Metro Detroit. The heavy-duty pickups will be updated shortly after the release of the '16 Silverado and Sierra 1500 models. Versions of the trucks feature revised exterior styling, with features—LED running lights and revised grilles—lifted from some passenger car models. The changes expected under the hood include the 6.2L gas V8 from the 1500 models and an updated Duramax turbodiesel, with improved power and fuel efficiency to keep up with what Ford and Ram trucks offer in this segment. The eight-speed automatic is expected to become the main transmission in these trucks now. Expect to see the Silverado and Sierra 3500 HD Dually late this year or early in 2016.