This GMC Sierra 3500HD boasts a Gas V8 6.6L/ engine powering this Automatic transmission. WHEELS, 18 (45.7 CM) 8-SPOKE PAINTED STEEL, SILVER EXTENDED (STD), UPFITTER SWITCH KIT, (5) Provides 3-30 amp and 2-20 amp configurable circuits to facilitate installation of aftermarket electrical accessories. Kit with all required parts will be shipped loose with the truck for installation by the dealer or upfitter at customer expense. Installation instructions and technical assistance available at www.gmupfitter.com., TRANSMISSION, 10-SPEED AUTOMATIC (STD).* This GMC Sierra 3500HD Features the Following Options *SNOW PLOW PREP/CAMPER PACKAGE includes (KW5) 220-amp alternator, includes increased front GAWR on Heavy Duty models, (NZZ) skid plates (transfer case and oil pan), pass through dash grommet hole and roof emergency light provisions. Contact GM Upfitter Integration at www.gmupfitter.com for plow installation details and assistance. Note: if ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions and includes (KW5) 220-amp alternator , TIRES, LT275/70R18E ALL-TERRAIN, BLACKWALL (STD), TIRE, SPARE LT275/70R18 ALL-TERRAIN, BLACKWALL (STD), SUMMIT WHITE, SKID PLATES protect the oil pan, front axle and transfer case, SINGLE REAR WHEELS (STD), SEATS, FRONT 40/20/40 SPLIT-BENCH with covered armrest storage and under-seat storage (lockable) (STD), REAR AXLE, 3.73 RATIO, PRO PREFERRED EQUIPMENT GROUP includes standard equipment, PICKUP BED includes bed assist step (STD).