The 2020 GMC Sierra 3500HD moves to General Motors' latest full-size pickup platform, which debuted on regular-duty Sierra 1500 trucks last year. This means a longer wheelbase, a taller cab, greater towing capability, and additional possibilities for handling cargo.
The all-new 3500HD also gets a larger, more powerful base engine and a new 10-speed transmission for the optional DuraMax turbodiesel. The lineup now includes an AT4 model designed for off-roading.
As the brawniest truck in the GMC lineup, the 3500HD is available with dual rear wheels and can tow up to 35,500 pounds – a whopping 52% increase over last year.