This GMC Sierra 2500HD boasts a Gas V8 6.6L/ engine powering this Automatic transmission. WHEELS, 17 (43.2 CM) PAINTED STEEL, SILVER, USB PORTS, (2) CHARGE-ONLY, REAR, TRANSMISSION, ALLISON 10-SPEED AUTOMATIC.* This GMC Sierra 2500HD Features the Following Options *CONVENIENCE PACKAGE , TIRES, LT245/75R17E ALL-SEASON, BLACKWALL, SUMMIT WHITE, SPARE TIRE DELETE, SEATS, FRONT 40/20/40 SPLIT-BENCH, REAR AXLE, 3.73 RATIO, PRO PREFERRED EQUIPMENT GROUP, POWER OUTLET, INSTRUMENT PANEL, 120-VOLT, PICKUP BED, DELETE, MIRRORS, OUTSIDE POWER-ADJUSTABLE VERTICAL TRAILERING.