2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Regular Cab Long Box in Onyx Black: Front and side view of a heavy-duty pickup truck with chrome grille and extended cab

Front and side view of a heavy-duty pickup truck with chrome grille and extended cab

Heavy-duty pickup truck showing front chrome grille, dual headlights, large bumper, extended cab with four doors, long cargo bed, side steps, and rugged all-terrain tires.

View Dimensions of the 2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Regular Cab Long Box

View 18 images of the 2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Regular Cab Long Box

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