GM?s 2500 and 3500 HD lineup

GMC?s all-new 2011 Sierra 2500HD and 3500HD trucks are comprehensively redesigned and will go on sale in early summer ? including the most powerful diesel engine in the segment. Sierra HD?s new 6.6L Duramax turbo diesel delivers 397 horsepower at 3,000 rpm and 765 lb.-ft. of torque at 1,600 rpm. ?The new Sierra HD is the latest expression of GMC?s philosophy of blending capability with premium features and styling,? said Lisa Hutchinson, GMC product marketing director. ?It is a premium tool that offers many comfort and infotainment features, along with a maximum towing capacity of 15,600 pounds with the segment?s most powerful diesel ? that?s enough to tow a 34-foot-long, three-axle travel trailer.?