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The 2017 Chevrolet Silverado HD lineup adds a new 6.6L V-8 turbo-diesel paired with an Allison 6-speed automatic transmission. The trucks also add an air intake in the hood. Here's a closer look at the Silverado 3500 LT crew cab 4WD with dual rear wheels. Read more about the new engine herePhotos by Vince Taroc.