Recently freshened, the HD Sierras (and its Silverado twin) are designed for heavy towing and hauling, and ride stiffer than the Sierra 1500. The standard engine is a 6.0-liter V8. The 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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GMC Sierra 2500HD Road Test

Recently freshened, the HD Sierras (and its Silverado twin) are designed for heavy towing and hauling, and ride stiffer than the Sierra 1500. The standard engine is a 6.0-liter V8. The 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. Braking and handling capabilities come close to matching the half-ton Sierra. Handling is not agile but has a modicum of responsiveness that other three-quarter-ton trucks don't provide. Reliability of the turbodiesel version is well below average.

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