Allison 1000 6-Speed Automatic, 4WD, Ebony Cloth.2013 Chevrolet Silverado 2500HD LT 4D Crew Cab 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 Turbodiesel**Every one of our Pre-Owned Vehicles goes through a Complete Safety Inspection by one of our GM Certifed Technicians. Each one Receives: Fresh Oil Change & Filter, Brand New Wiper Blades, an Alignment, and a Complete Exterior & Interior Clean.**Reviews:* Impressive hauling and towing capabilities; refined and quiet ride; solid build quality; responsive steering. Source: Edmunds* If you’ve been a longtime Chevy Silverado HD fan and it’s time to trade in your old rig, the features in the 2013 model should help you remain loyal. For those looking to potentially save fuel costs, the compressed natural gas option may make the Silverado 2500 HD more tempting. Source: KBB.com