The 2020 GMC Sierra 3500HD AT4 represents the pinnacle of heavy-duty off-road capability, combining the brand's most muscular truck platform with a distinctive rugged identity. Finished in Carbon Black Metallic, this AT4 is driven by dark chrome exterior finishes, body-color bumpers, and a bold black chrome grille set off by signature red vertical recovery hooks .
At its heart lies the legendary Duramax 6.6L turbo-diesel V8 engine, delivering an SAE-certified 445 horsepower and 910 lb-ft of torque. This immense power is channeled through the segment-first Allison 10-speed automatic transmission, paired with a capable 4WD system featuring an Auto 4WD mode for seamless traction on varying surfaces. The AT4's off-road prowess is rooted in a unique suspension with Rancho shocks, skid plates, and an Eaton locking rear differential, along with a Traction Select System featuring a dedicated Off-Road mode .
The athletic interior carries AT4-specific darkened trim, including dark-tinted and textured aluminum finishes on the steering wheel and center stack, paired with a unique Jet Black interior featuring Kalahari color accents and live stitching. Standard leather-appointed seating with mini-perforated inserts and embroidered AT4 badging on the headrests delivers durability with uncompromising comfort, alongside all-weather floor liners. The cabin also features a Head-Up Display with an Off-Road Inclinometer and HD Surround Vision for low-speed views of the vehicle's surroundings.
Advanced technology includes the GMC Infotainment System with an 8-inch touchscreen, navigation, Apple CarPlay and Android Auto capability, and a Bose premium seven-speaker audio system. The AT4 also boasts the segment-first MultiPro six-function tailgate, a 120-volt power outlet, and class-leading heavy-duty cargo bed volume with 12 corner tie-downs.
Engineered for those who demand maximum capability with off-road readiness, this Sierra 3500HD AT4 delivers a maximum trailering rating of up to 35,500 pounds when properly equipped with the diesel engine and gooseneck hitch. With its blend of Duramax diesel power, Allison transmission refinement, and rugged AT4 identity, it stands as a benchmark in the premium heavy-duty off-road truck segment.
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Used 2020 GMCSierra 3500HD AT4 Truck Duramax V8 Turbodiesel
- Diesel
- Exterior Color
- Carbon Black Metallic
- Interior Color
- Jet Black With Kalahari Accents
- Odometer
- 199,608 miles
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4WD
- Engine
- Duramax 6.6L V8 Turbodiesel
- VIN
- 1GT49VEY9LF219012
- Stock Number
- 65896A
Included Packages & Accessories
- 6 Speakers
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Air Conditioning
- Automatic temperature control
- Front dual zone A/C
- Rear window defroster
- Memory seat
- Power driver seat
- Power steering
- Power windows
- Remote keyless entry
- Steering wheel mounted audio controls
- Speed-sensing steering
- Traction control
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Dual front side impact airbags
- Front anti-roll bar
- Front wheel independent suspension
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Power Sunroof
- Pickup Bed
- Brake assist
- Electronic Stability Control
- Lane Departure Warning System
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Panic alarm
- Security system
- Speed control
- 220 Amp Alternator
- Engine Block Heater
- Exhaust Brake
- Heavy-Duty 80 Amp Battery
- High Idle Switch
- 3" Round Black Tubular Off-Road Assist Steps (LPO)
- Auto-dimming door mirrors
- Black Front & Rear Molded Splash Guards (LPO)
- Bumpers: body-color
- Front License Plate Kit
- Heated door mirrors
- Power door mirrors
- Rear step bumper
- Turn signal indicator mirrors
- Winter Grille Cover
- 2 USB Ports (First Row)
- All-Weather Floor Liners w/AT4 Logo (LPO)
- Apple CarPlay/Android Auto
- Auto-dimming Rear-View mirror
- Compass
- Console-Mounted Safe (LPO)
- Driver door bin
- Driver vanity mirror
- Front reading lights
- Heated steering wheel
- Illuminated entry
- Outside temperature display
- Overhead console
- Passenger vanity mirror
- Rear reading lights
- Rear seat center armrest
- Rear Seat Infotainment System w/DVD Player (LPO)
- Rear Underseat Storage (LPO)
- Tachometer
- Telescoping steering wheel
- Tilt steering wheel
- Trailer Tire Pressure Monitor Sensors
- Trip computer
- Upfitter Switch Kit (5)
- Voltmeter
- Front Center Armrest
- Heated front seats
- Heated rear seats
- Perforated Leather-Appointed Front Seat Trim
- Power passenger seat
- Split folding rear seat
- Ventilated front seats
- Passenger door bin
- Alloy wheels
- Variably intermittent wipers
- AT4 Preferred Package
- AT4 Premium Package
- Cargo Convenience Package
- Driver Alert Package I
- Driver Alert Package II
- Gooseneck/5th Wheel Package
- Gooseneck/5th Wheel Prep Package
- Preferred Equipment Group 4SB
- Snow Plow Prep/Camper Package
- Technology Package
- X31 Off-Road Package
- 6-Speaker Audio System Feature
- Bose Premium 7 Speaker Sound System
- HD Radio
- Radio: AM/FM w/Prem GMC Infotainment System & Navi
- Radio: AM/FM w/Premium GMC Infotainment System
- SiriusXM w/360L
- Steering Wheel Audio Controls
- Electric Rear-Window Defogger
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 120-Volt Instrument Panel Power Outlet
- Driver Memory
- Power Front Passenger Windows w/Express Up/Down
- Power Front Windows w/Driver Express Up/Down
- Power Rear Windows w/Express Down
- Remote Vehicle Starter System
- Universal Home Remote
- Manual Tilt-Wheel/Telescoping Steering Column
- Off-Road Suspension
- Electrical Lock Control Steering Column
- Keyless Open & Start
- Power Door Locks
- Red Recovery Hooks
- Hill Descent Control
- Unauthorized Entry Theft-Deterrent System
- 2-Speed Active Transfer Case
- IntelliBeam Automatic High Beam On/Off
- LED Cargo Area Lighting
- LED Smoked Amber Roof Marker Lamps
- Painted Blk Surround Grille w/High Gloss Blk Mesh
- ProGrade Trailering System
- Rear Wheelhouse Liners
- Spray-On Pickup Bed Liner w/AT4 Logo
- 2 USB Ports Inside Console
- 2nd Row Dual USB Charge-Only Ports
- 4.2" Diagonal Color Display Driver Info Center
- 4G LTE Wi-Fi Hotspot Capable
- 8" Driver Information Center
- Auto-Dimming Inside Rearview Mirror w/Camera
- Automatic Emergency Braking
- Bed View Camera
- Compass Located In Instrument Cluster
- Floor-Mounted Center Console
- Following Distance Indicator
- Forward Collision Alert
- GMC Connected Access Capable
- HD Rear Vision Camera
- HD Surround Vision w/2 Trailer View Camera Provisions
- Lane Change Alert w/Side Blind Zone Alert
- Multicolor 15" Diagonal Head-Up Display
- OnStar & GMC Connected Services Capable
- Rear Cross Traffic Alert
- Safety Alert Seat
- Ultrasonic Front & Rear Park Assist
- Wireless Charging
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- 2nd Row Heated Outboard Seats
- Front Bucket Seats
- Heated Driver & Front Outboard Passenger Seats
- Ventilated Driver & Front Passenger Seats
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
- Integrated Trailer Brake Controller
- Wheels: 18" 6-Spoke Machined Aluminum
- Wheels: 20" 6-Spoke Bright Machined Aluminum
- Deep-Tinted Glass
- Power Sliding Rear Window w/Defogger
Detailed Specifications
- 1st and 2nd row curtain head airbags
- 4-wheel ABS Brakes
- ABS and Driveline Traction Control
- Aluminum dash trim
- Aluminum/sim carbon fibre center console trim
- Aluminum/sim carbon fibre door trim
- Anti-theft alarm system
- Audio System Premium Brand : Premium GMC Infotainment System
- Audio controls on steering wheel
- Automatic front air conditioning
- Auxilliary engine cooler
- Auxilliary transmission cooler
- Bluetooth wireless phone connectivity
- Braking Assist
- Bucket front seats
- Climate Controlled : Driver and passenger heated
- Compass
- Cruise control
- Cruise controls on steering wheel
- Daytime running lights
- Digital Audio Input
- Driver seat memory
- Dual front air conditioning zones
- Dual illuminated vanity mirrors
- Electrochromatic auto-dimming mirrors
- Electrochromatic rearview mirror
- External temperature display
- Fold-up cushion rear seats
- Front Ventilated disc brakes
- Front and rear reading lights
- Front fog/driving lights
- Heated driver mirror
- Heated passenger mirror
- Heated steering wheel
- Leather seat upholstery
- Leather/aluminum steering wheel trim
- Machined aluminum rims w/ painted accents
- Memorized Settings for 2 drivers
- Memorized Settings including door mirror(s)
- Passenger Airbag
- Power extendable trailer style exterior mirrors
- Power remote driver mirror adjustment
- Power remote passenger mirror adjustment
- Power retractable mirrors
- Power windows
- Premium GMC Infotainment System
- Privacy glass: Deep
- Rear seats center armrest
- Remote Engine Start : Keyfob remote start
- Remote power door locks
- Remote window operation
- Side airbag
- SiriusXM with 360L AM/FM/HD/Satellite
- SiriusXM with 360L Satellite Radio
- Speed Sensitive Audio Volume Control
- Speed-proportional power steering
- Split rear bench
- Stability controll with anti-roll
- Suspension class: Off-road
- Tachometer
- Tilt and telescopic steering wheel
- Total Number of Speakers: 6
- Trailer hitch
- Trip computer
- Turn signal in mirrors
- Urethane shift knob trim
- Video Monitor Location: Front
- Wheel Diameter: 18
- Wheel Width: 8
Standard Features
- AT4 Preferred Package
- Driver Alert Package I
- Wheels: 20" 6-Spoke Bright Machined Aluminum
- HD Surround Vision w/2 Trailer View Camera Provisions
- Auto-Dimming Inside Rearview Mirror w/Camera
- Bed View Camera
- Multicolor 15" Diagonal Head-Up Display
- 8" Driver Information Center
- Universal Home Remote
- Power Sliding Rear Window w/Defogger
- Radio: AM/FM w/Prem GMC Infotainment System & Navi
- Bose Premium 7 Speaker Sound System
- LED Smoked Amber Roof Marker Lamps
- Wireless Charging
- Ultrasonic Front & Rear Park Assist
- Lane Change Alert w/Side Blind Zone Alert
- Rear Cross Traffic Alert
- Gooseneck/5th Wheel Prep Package
- Bed View Camera
- Forward Collision Alert
- Automatic Emergency Braking
- IntelliBeam Automatic High Beam On/Off
- Following Distance Indicator
- Safety Alert Seat
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Driver Memory
- Heated Driver & Front Outboard Passenger Seats
- Ventilated Driver & Front Passenger Seats
- 2nd Row Heated Outboard Seats
- Floor-Mounted Center Console
- Hill Descent Control
- Off-Road Suspension
- Hitch Guidance w/Hitch View
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- HD Radio
- Radio: AM/FM w/Premium GMC Infotainment System
- Floor-Mounted Center Console
- Compass Located In Instrument Cluster
- 4.2" Diagonal Color Display Driver Info Center
- Electric Rear-Window Defogger
- Power Door Locks
- Remote Vehicle Starter System
- Keyless Open & Start
- OnStar & GMC Connected Services Capable
- 4G LTE Wi-Fi Hotspot Capable
- GMC Connected Access Capable
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Instrument Panel Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 2 USB Ports Inside Console
- 2nd Row Dual USB Charge-Only Ports
- HD Rear Vision Camera
- Heated Driver & Front Outboard Passenger Seats
- Ventilated Driver & Front Passenger Seats
- Spray-On Pickup Bed Liner w/AT4 Logo
- 2nd Row Heated Outboard Seats
- Steering Wheel Audio Controls
- Manual Tilt-Wheel/Telescoping Steering Column
- Electrical Lock Control Steering Column
- Unauthorized Entry Theft-Deterrent System
- Deep-Tinted Glass
- Painted Blk Surround Grille w/High Gloss Blk Mesh
- Power Front Windows w/Driver Express Up/Down
- Power Front Passenger Windows w/Express Up/Down
- Power Rear Windows w/Express Down
- LED Cargo Area Lighting
- Red Recovery Hooks
- Wheels: 18" 6-Spoke Machined Aluminum
- Rear Wheelhouse Liners
- X31 Off-Road Package
- Integrated Trailer Brake Controller
- ProGrade Trailering System
- 2-Speed Active Transfer Case
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering System App
Dealer Notes
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