Configured only as a 2500HD Crew Cab Standard Bed four-wheel drive, the GMC Sierra HD AT4X is powered by the standard 6.6-liter V-8 gasoline engine (401 hp/464 lb-ft of torque) or the venerable 6. ...

The Sierra 2500HD AT4X AEV is really, really big Will Sabel Courtney Like many segments of the automotive world today, the pickup truck market has seen some serious inflation — not just in prices, but ...

Configured only as a 2500HD Crew Cab Standard Bed four-wheel drive, the GMC Sierra HD AT4X is powered by the standard 6.6-liter V-8 gasoline engine (401 hp/464 lb-ft of torque) or the venerable 6. ...