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 ...

If the Sierra 1500 is not enough truck, GMC offers the Sierra 2500HD. The current generation of this heavy-duty pickup truck went on sale for 2020, offering gasoline and diesel V-8 powertrains. It ...