Used 2023 GMC Sierra 3500HD AT4

The 2023 GMC Sierra 3500HD AT4 is built for those who demand uncompromising strength with premium refinement. Purpose-built for extreme work and off-road confidence, this heavy-duty truck pairs Duramax diesel muscle with AT4-exclusive rugged styling, advanced trailering tech, and a bold, upscale interior, ready for job sites, backcountry trails, and everything in between. 

Performance & Heavy-Duty Capability 

• Engine: 6.6L Duramax® V8 Turbo Diesel delivering immense torque and relentless pulling power 

• Transmission: Allison® 10-Speed Automatic engineered for smooth shifts under heavy load 

• Drivetrain: Autotrac® 4-Wheel Drive with two-speed transfer case for total control on any surface 

• Rear Axle Ratio: 3.42 ratio optimized for confident towing and hauling 

• GVWR: Up to 12,100 lbs for serious work capability 

• Exhaust Brake & Heavy-Duty Cooling Systems for enhanced downhill control and durability 

• Automatic Locking Rear Differential for maximum traction in demanding terrain 

AT4 Off-Road Confidence 

• Z71 Off-Road Suspension tuned for rugged stability and trail performance 

• Skid Plates & Hill Descent Control for protection and confidence on steep or uneven ground 

• Red Front Recovery Hooks and all-terrain tires for functional, aggressive capability 

• 20" Machined Aluminum Wheels with Gloss Black Accents for a bold AT4 stance 

Advanced Trailering & Work Tech 

• Gooseneck & 5th-Wheel Prep Package with stamped bed holes and integrated harness 

• Integrated Trailer Brake Controller for confident stopping power 

• Advanced Trailering System with multiple camera views including Bed View Camera 

• Hitch Guidance with Hitch View for easier, more precise hookups 

• Spray-On Bedliner & LED Cargo Bed Lighting for durability and visibility 

• 120V Bed-Mounted Power Outlet to support tools and equipment on the job 

Interior Comfort & AT4 Design 

• Jet Black Interior with Kalahari Accents blending toughness with upscale detail 

• Front Bucket Seats with power adjustability and driver memory 

• Heated & Ventilated Front Seats, Heated Rear Outboard Seats, and Heated Steering Wheel 

• Tri-Zone Automatic Climate Control for personalized comfort in every row 

• Power Sliding Rear Window & Rear Seat Storage Package for added practicality 

Technology & Connectivity 

• 8" GMC Premium Infotainment Touchscreen with intuitive controls 

• Wireless Apple CarPlay® & Android Auto™ integration 

• Multiple USB Ports and 120V Interior Power Outlet for work and travel convenience 

• Digital Driver Information Center providing key vehicle data at a glance 

• Wi-Fi® Hotspot Capability to stay connected on the road or at the worksite 

Safety & Driver Assistance 

• Rear Vision & Surround Trailering Cameras for enhanced visibility 

• Hill Start Assist, Trailer Sway Control & ABS Braking 

• Teen Driver Mode & Rear Seat Reminder for added peace of mind 

• Heated, Power-Adjustable Trailering Mirrors with auto-dimming for clear rearward views 

Exterior Presence & Utility 

• AT4-Specific Blacked-Out Styling with body-color bumpers 

• LED Headlamps, Fog Lamps, and Signature Lighting for maximum visibility 

• GMC MultiPro™ Tailgate offering multiple configurations for loading and access 

• CornerStep Rear Bumper for easier bed entry 

Built for the toughest demands, the 2023 GMC Sierra 3500HD AT4 delivers diesel strength, advanced trailering confidence, and premium comfort in one commanding package. Whether towing heavy equipment, navigating rough terrain, or driving with authority every day, this AT4 stands ready, powerful, capable, and unmistakably GMC.