A side by side comparison of 2006 and 2007 Silverado trucks, both extended cab models, helps you see the differences. The 2007 Silverado has a wider and taller grill. Headlamps have been pulled towards the outer edges of the body and are sleeker looking. The windshield has a deeper slope. Bumpers have been restyled--some Silverado trucks have chrome versions and others have body colored bumpers.