**** Black Widow Package added, price of package is not reflected in the MSRP.****This GMC Sierra 2500HD delivers a Turbocharged Diesel V8 6.6L/ engine powering this Automatic transmission. 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, TRAILERING WIRING PROVISIONS, FOR TRAILERING, 5TH WHEEL AND GOOSENECK TRAILER includes additional 7-way wiring harness located at the rear of the pickup bed attached to the rear frame cross member.*This GMC Sierra 2500HD Features the Following Options *DENALI RESERVE PACKAGE includes (CWM) Technology Package and (CF5) power sunroof , TRAILER TIRE PRESSURE MONITOR SENSORS includes set of 4 sensors. Sensor functionality requires (UET) In-Vehicle Trailering App to be ordered with the vehicle and installed by the factory. Sensors will be shipped loose with the truck and will need to be installed on trailer by customer. System is capable of monitoring up to 6 wheels. Additional or replacement sensors are available through GM Accessories, STERLING METALLIC, REAR AXLE, 3.42 RATIO, GVWR, 11,350 LBS. (5148 KG), ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE (470 hp 350.5 kW @ 2800 rpm, 975 lb-ft of torque 1322 Nm @ 1600 rpm) (Includes (K05) engine block heater.), ASSIST STEPS, POWER-RETRACTABLE, WITH LED PERIMETER LIGHTING AND BRIGHT ACCENT, ALTERNATORS, DUAL, 220-AMPS PRIMARY, 170-AMPS AUXILIARY, Wireless phone projection for Apple CarPlay and Android Auto, Wireless Charging.