GM gives its big pickups a much-needed makeover - Article Photos 4/4

Mark Reuss, General Motors North America President, introduces the 2014 GMC Sierra and Chevrolet Silverado in Pontiac, Mich., Thursday, Dec. 13, 2012. The revamped Silverados and Sierras are aimed at putting GM back in front. They look similar to the old models, but are a little more aggressive and aerodynamic-looking. (AP Photo/Paul Sancya)