The 3500HD GMC SIERRA SLE with 6.6-liter Duramax turbocharged diesel V-8's power and torque have increased to 470 horsepower and 975 pound-feet of torque respectively. The increased power has increased the towing capacity across the Sierra 2500HD and 3500HD lineup, with a higher max rating of 22,500 pounds at the hitch. The 401-hp 6.6-liter V-8 gas engine's six-speed automatic is replaced by the Allison-certified 10-speed automatic, previously exclusive for the diesel engine.
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