2015 Chevrolet Silverado HD and 2015 GMC Sierra HD First Look Decisions, Decisions, Decisions: Sports Cars Don't Get Better Than This Although the 2011 Chevrolet Silverado HD and GMC Sierra HD pickups were nearly indistinguishable from the 2010 models, significant improvements included a fully boxed frame with an updated Duramax diesel engine and Allison transmission. Visual updates are finally part of the package for the revised 2015 Chevrolet Silverado HD and 2015 GMC Sierra HD trucks, which also receive upgrades under the sheetmetal as well. While 2015 Chevrolet Silverado HD and 2015 GMC Sierra HD models use essentially the same cab and beds as the 1500 models, the front ends feature larger grilles with chrome trim and cooling intakes, a new hood and headlights, and chrome bumpers. Other changes increase reduced interior noise and increased efficiency. Improved cooling ability comes from a new sealed front end that uses cooling air more efficiently as well as the engine air intake located outside of the hot engine compartment to better maintain power levels while hauling and towing in hot weather.
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