6-Speed Automatic HD Electronic with Overdrive, 4WD, Cocoa/Dune Leather.2015 GMC Sierra 2500HD SLTVortec 6.0L V8 SFI Flex Fuel VVT 4WDWe Make it Easy! Check out the rest of the options and features. Heavy-Duty Trailering Equipment, Off-Road Package (Hill Descent Control and Z71 Badging), Snow Plow Prep Package (220 Amps Alternator and Provision for Cab Roof-Mounted Lamp/Beacon), Standard Suspension Package, 6-Speed Automatic HD Electronic with Overdrive, 4WD, Cocoa/Dune Leather, 110-Volt AC Power Outlet, 18 Chromed Aluminum Wheels, 4-Wheel Disc Brakes, 4.10 Rear Axle Ratio, 4.2 Diagonal Color Display Driver Info Center, 6 Speakers, ABS brakes, Adjustable pedals, Air Conditioning, Alloy wheels, AM/FM radio: SiriusXM, Auto-dimming door mirrors, Auto-Dimming Inside Rear-View Mirror, Auto-dimming Rear-View mirror, Automatic temperature control, Bluetooth® For Phone, Bodyside moldings, Brake assist, Bumpers: chrome, Camper & 5th Wheel Trailer Wiring Provisions, CD player, Chrome Bodyside Moldings, Chrome Door Handles, Chrome Front Bumper, Chrome Mirror Caps, Chrome Rear Bumper, Chrome wheels, Color-Keyed Carpeting Floor Covering, Compass, Deep-Tinted Glass, Delay-off headlights, Driver & Front Passenger Visors, Driver door bin, Driver vanity mirror, Dual front impact airbags, Dual front side impact airbags, Dual-Zone Automatic Climate Control, Electric Rear-Window Defogger, Electronic Shift Transfer Case, Electronic Stability Control, Emergency communication system: OnStar Directions & Connections, Engine Block Heater, Exterior Parking Camera Rear, EZ-Lift & Lower Tailgate, Front 40/20/40 Split Bench Seat, Front anti-roll bar, Front Center Armrest w/Storage, Front dual zone A/C, Front fog lights, Front Halogen Fog Lamps, Front License Plate Kit, Front reading lights, Front wheel independent suspension, Fully automatic headlights, Garage door transmitter, Heated door mirrors, Heated Driver & Front Passenger Seats, Heated front seats, Heated Leather Steering Wheel, Heated Power-Adjustable Outside Mirrors, Illuminated entry, Leather Appointed Seat Trim, Leather-Wrapped Steering Wheel, LED Cargo Box Lighting, Low tire pressure warning, Manual Tilt-Wheel/Telescoping Steering Column, Memory seat, Occupant sensing airbag, OnStar 4G LTE Wi-Fi Hotspot, OnStar 6 Months Directions/Connections Plan, Outside temperature display, Overhead airbag, Overhead console, Panic alarm, Passenger door bin, Passenger vanity mirror, Power door mirrors, Power driver seat, Power passenger seat, Power steering, Power windows, Power Windows w/Driver Express Up & Down, Power-Adjustable Pedals For Accelerator & Brake, Radio: AM/FM/SiriusXM, Rear 60/40 Folding Bench Seat (Folds Up), Rear Bumper Cornersteps, Rear reading lights, Rear seat center armrest, Rear step bumper, Rear Vision Camera w/Dynamic Guide Lines, Rear Wheelhouse Liners, Rear window defroster, Remote Keyless Entry, Remote keyless entry, Remote Vehicle Starter System, Security system, Single Slot CD/MP3 Player, SiriusXM Satellite Radio, SLT Decor, Speed control, Split folding rear seat, Steering Wheel Audio Controls, Steering wheel mounted audio controls, Tachometer, Telescoping steering wheel, Theft Deterrent System (Unauthorized Entry), Tilt steering wheel, Traction control, Trip computer, Turn signal indicator mirrors, Ultrasonic Front & Rear Park Assist, Universal Home Remote, Variably intermittent wipers, and Voltmeter