AT4KEY STANDARD FEATURESDuramax® 3.0L Turbo-Diesel engine with 10-speed automatic transmission2" factory lift with off-road suspension and Rancho® monotube shocks Two-speed Autotrac® transfer case and underbody skid platesUnique Jet Black interior with Kalahari accents, and heated and ventilated perforated leather front seating surfaces   KEY AVAILABLE FEATURES15" diagonal multicolour Head-Up Display3.0L Duramax V6 engine with 10-speed automatic transmissionThe Sierra 1500 AT4 off-road truck is built to help you master untamed terrain. Equipped by off-road recreational driving and overland adventure travel experts American Expedition Vehicles (AEV®), it features: AEV stamped steel front and rear bumpers with front winch capability​Four hot-stamped boron steel AEV skid plates​Exclusive AEV badging on bumpers, embroidered head restraints and all-weather floor liners​AEV racing-inspired Salta wheels with 12-spoke design and recessed valve stems​ Off-road rocker panel protectors to help shield the sills and frame rails, and an optional bolt-on step assist when not off-roadingExteriorAT4 FRONT BUMPER AND GRILLE Grille with black chrome header, insert bars with gloss-black accents and red recovery hooks.SPRAY-ON BEDLINERAT4, off-road trucks offer high-strength steel cargo beds featuring spray-on bedliner with GMC logo.Full-width position.Inner-gate load stop.Inner gate open.Integrated Kicker* audio system.33" MT TIRESAvailable off-road MT tires help you confidently conquer the terrain in your AT4 — even in harsh conditions. The world’s first six-function GMC MultiPro Tailgate helps improve loading, unloading and accessing the cargo box.Open the primary gate using the key fob’s power release Load stop to help prevent items from sliding out of the bedFold-down inner gate for easy access when loading and unloadingInner gate can fold into a full-width step, capable of holding up to 170 kg (375 lbs.)Inner gate load stop to help prevent second-tier items from sliding out of the bedInteriorCreate five custom trailer profiles based on trailer name, trailer type and trailer hitch typeTrailer Tire Pressure Monitoring SystemTrailer Light Sequence, which includes automatic lighting test sequenceMaintenance remindersStep-by-step pre-departure checklistsStay in touch and in command — whether you’re in your vehicle or out. The myGMC mobile app helps you get the most out of your GMC Sierra 1500:Remotely start or stop your properly equipped vehicle, lock and unlock* the doors, and moreFind routes using the Map Tab and send them to your preferred mapping appView your vehicle’s health status, such as fuel level, tire pressure,oil life and moreTransparent Trailer ViewHitch ViewBed View with Zoom & Hitch GuidanceFront Camera ViewStandard Rear Camera ViewSurround ViewFront Top-Down View Rear Top-Down ViewFront Side ViewRear Side View with Trailer BiasingRear Trailer View with Trailer Angle IndicatorInside Trailer ViewPicture-in-Picture Side ViewRear Camera MirrorHEAD-UP DISPLAYProjects the following key information directly onto your windshield:SpeedMobile AlertsForward Collision AlertLane Departure WarningCruise Control and moreInner gate can be disabled to prevent it from being opened when a hitch or other equipment is installedThe opened inner gate provides a work surface as well as second-tier loadingTake music outdoors with the available integrated MultiPro Audio System by KICKERAdapAdaptive Cruise Contrallows you to set a cruise control speed and automatically follow a detected vehicle ahead at a driver-selected following gap. If no vehicle is detected in your path, the feature works like regular cruise control. You can always override the feature and take control. tive Cruise Controllows you to set a cruise control speed and automatically follow a detected vehicle ahead at a driver-selected following gap. If no vehicle is detected in your path, the feature works like regular cruise control. You can always override the feature and take control.