The HD Sierra is designed for heavy towing and hauling, and rides more stiffly than the Sierra 1500. The standard engine is a 6.0-liter V8. Our tested 397-hp, 6.6-liter turbodiesel produced a whopping 765 foot-pounds of torque and could haul close to a 2,500-pound payload. The diesel is punchy but noisy, and the Allison-made six-speed automatic is smooth.
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