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2021 GMC Sierra 1500 Overview Photo: GMC With its muscular capabilities, sophisticated design, and advanced technologies, the 2021 GMC Sierra 1500 checks all the boxes — and more — for a well-rounded modern truck. For 2021, the Sierra is available in Sierra, SLE, Elevation, SLT, AT4, and Denali trims. It can be equipped with three different cab options, three different box lengths, and either FWD or AWD. Photo: GMC What’s new for 2021 For 2021, the Sierra offers a variety of improved feat...