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The 2021 GMC Sierra 2500HD, part of the heavy-duty truck's third generation, is a powerful and versatile workhorse. It is available with either a 401-horsepower 6.6-liter V8 gasoline engine or a 445-horsepower 6.6-liter V8 turbodiesel. Both engines are paired with a six-speed automatic transmission, with four-wheel drive as an available option. Its five trims — base, SLE, SLT, AT4, and Denali — offer varying levels of luxury and technology. The Denali, for example, features premium leather upholstery, an 8-inch touchscreen infotainment system with Apple CarPlay, Android Auto, and a Bose audio system. This model is also known for its advanced safety features like forward collision warning, blind-spot monitoring, and an innovative system for easier trailering. With these capabilities, the Sierra 2500HD provides a compelling blend of performance, comfort, and utility.
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