The 2020 GMC Sierra 3500HD is all-new this year. Improvements over the previous generation include an all-new gasoline engine, stiffer and stronger frame, and an excellent Allison automatic gearbox when the diesel is ordered.The Sierra 3500HD is styled like the lighter-duty 2500HD, which in turn is inspired by the smaller Sierra 1500. That means lots of chrome, even in entry-level trims, as well as a more upscale and conventional appearance compared to the closely related Chevrolet Silverado HD. 2020 GMC Sierra 3500HD Comes With 6.6-liter Duramax diesel V8 engine to handle loads that are heavy. New technology also improves the GMC's trailering capacity. The 2020 Sierra 3500HD offers an updated ProGrade Trailering system with 15 camera views, including one that allows the driver to virtually see through a trailer for greater visibility and maneuverability. Loading the bed is easier thanks to standard corner-step bumpers and side bed steps, and the available MultiPro tailgate is the equivalent of a Swiss Army knife, supplying six configurations to assist with loading, hauling and working. 

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