Article Photos: GM gives its big pickups a much-needed makeover 1/4

This undated handout photo  made available by General Motors shows the 2014 Chevrolet Silverado. General Motors unveiled a new versions of its top-selling Chevrolet Silverado and GMC Sierra on Thursday Dec. 13, 2012. The 2014 models will go on sale by early spring or late summer. The models roll into a market where truck sales are growing after a five-year slump.  (AP Photo/General Motors)