Clean CARFAX. Onyx Black 2018 GMC Sierra 2500HD Denali 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 TurbodieselRecent Arrival! Allison 1000 6-Speed Automatic, 4WD, Jet Black Leather.Join the 2 Million Customers and CountingED MORSE 75 YEARS OF EXCELLENCE!Equipped with Driver Alert Package (Forward Collision Alert, Lane Departure Warning System, and Ultrasonic Front & Rear Park Assist), Duramax Plus Package (Chrome Power-Adjustable Heated Outside Mirrors and Chrome Recovery Hooks), Gooseneck/5th Wheel Prep Package, Heavy-Duty Handling/Trailering Suspension Package, Off-Road Package (Hill Descent Control and Z71 Chrome Front Fender Emblems), Preferred Equipment Group 5SA (110-Volt AC Power Outlet, 150 Amps Alternator, 8" Multi-Color Driver Instrument Info Display, Auto-Dimming Inside Rear-View Mirror, Black Frame-Mounted Front Recovery Hooks, Body-Color Front Bumper, Bose 7 Speaker Sound System, Chrome Bodyside Moldings, Chrome Door Handles, Color-Keyed Carpeted Floor Mats, Color-Keyed Carpeting Floor Covering, Deep-Tinted Glass, Driver & Front Passenger Vanity Mirror Visors, Dual-Zone Automatic Climate Control, Electric Rear-Window Defogger, Electronic Shift Transfer Case, EZ-Lift & Lower Tailgate, Front Halogen Fog Lamps, GMC 4G LTE, GMC Connected Access, HD Radio, Heated & Ventilated Front Bucket Seats, Heated Leather Wrapped Steering Wheel, Heated Power-Adjustable Outside Mirrors, Manual Tilt-Wheel/Telescoping Steering Column, OnStar & GMC Connected Services Capable, Power Sliding Rear Window w/Defogger, Power Windows w/Driver Express Up & Down, Power-Adjustable Pedals For Accelerator & Brake, Rear 60/40 Folding Bench Seat (Folds Up), Rear Body-Color Bumper w/Bumper CornerSteps, Rear Wheelhouse Liners, Remote Keyless Entry, Remote Locking Tailgate, Remote Vehicle Starter System, Single Slot CD/MP3 Player, SiriusXM Satellite Radio, Steering Wheel Audio Controls, Theft Deterrent System (Unauthorized Entry), and Universal Home Remote), Snow Plow Prep Package (220 Amps Alternator and Provision for Cab Roof-Mounted Lamp/Beacon), Trailering Equipment (Trailer Brake Controller), Allison 1000 6-Speed Automatic, 4WD, Jet Black Leather, 1-Piece Radiator Grille/Front Bumper Opening Cover, 4-Wheel Disc Brakes, 7 Speakers, ABS brakes, Adjustable pedals, Air Conditioning, All-Weather Floor Liner (LPO), Alloy wheels, AM/FM radio: SiriusXM, Apple CarPlay/Android Auto, Auto-dimming door mirrors, Auto-dimming Rear-View mirror, Automatic temperature control, Bluetooth® For Phone, Bodyside moldings, Brake assist, Bumpers: body-color, CD player, Chrome wheels, Compass, Delay-off headlights, Driver door bin, Driver vanity mirror, Dual front impact airbags, Dual front side impact airbags, Electronic Stability Control, Engine Block Heater, Exhaust Brake, Exterior Parking Camera Rear, Floor Mounted Console, Front & Rear Molded Splash Guards, Front anti-roll bar, Front Bucket Seats, Front Center Armrest, Front dual zone A/C, Front fog lights, Front Full Feature Ventilated Bucket Seats, Front License Plate Kit, Front reading lights, Front wheel independent suspension, Fully automatic headlights, Garage door transmitter, Heated door mirrors, Heated Driver and Front Passenger Seats, Heated front seats, Heated steering wheel, High-Intensity Discharge Headlights, Illuminated entry, Low tire pressure warning, Memory seat, Navigation System, Occupant sensing airbag, Outside temperature display, Overhead airbag, Overhead console, Panic alarm, Passenger door bin, Passenger vanity mirror, Perforated Leather Appointed Seat Trim, Power door mirrors, Power driver seat, Power passenger seat, Power steering, Power windows, Premium audio system: GMC Infotainment System, Radio: AM/FM/SiriusXM/HD w/Navigation, Rear reading lights, Rear seat center armrest, Rear step bumper, Rear Underseat Storage (LPO), Rear window defroster, Remote keyless entry, Security system, Smoked Amber Roof Marker Lamps, Speed control, Speed-sensing s