2025 GMC Sierra 2500HD AT4X 4WD Crew Cab â 6.6L Duramax Diesel 18,500 Miles Experience premium heavy-duty capability with this 2025 GMC Sierra 2500HD AT4X 4WD Crew Cab. With only 18,500 miles, this Sierra is barely broken in and delivers the perfect combination of rugged off-road readiness and refined luxury. Under the hood is the powerful 6.6L Duramax Turbo Diesel paired with an Allison automatic transmission, providing exceptional towing, torque, and long-term reliability. The AT4X trim is GMCâs most capable and exclusive off-road HD package, featuring a factory-lifted stance, advanced 4WD system, and premium suspension designed to handle challenging terrain while maintaining a smooth on-road ride. The Crew Cab offers a spacious, upscale interior with high-end materials, advanced technology, and driver-focused comfort, making long workdays or road trips effortless. If youâre looking for a like-new heavy-duty diesel truck that stands out with bold styling, serious capability, and luxury-level features, this 2025 GMC Sierra 2500HD AT4X is an outstanding opportunity. Contact us today for more details or to schedule your test drive. WE DELIVER! BUY ONLINE-TEXT-EMAIL-CHAT-PHONE AND WE WILL DELIVER YOUR NEXT VEHICLE TO YOUR DOOR! FROM OUR SALES FLOOR TO YOUR DOOR! IT'S THAT EASY! Onyx Black 2025 GMC Sierra 2500HD AT4X 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel **CARFAX CLEAN**, **CARFAX ONE OWNER**, **LOCAL TRADE**, Clean Title, 10-Speed Automatic, 4WD, Obsidian Rush Leather, 120-Volt Bed Mounted Power Outlet, 120-Volt Instrument Panel Power Outlet, 2 Charge-Only Rear USB Ports, 2 Charge/Data USB Ports Inside Center Console, 2 USB Ports, 2-Speed Active Transfer Case, Bed View Camera w/2 Trailer Camera Provisions, Bose Premium Series 12-Speaker System, Deep-Tinted Glass, Electric Rear-Window Defogger, Floor-Mounted Center Console, Front Prem Floor Liners w/Removable Carpet Insert, Front Rain-Sensing Wipers, Gloss Black Header Grille & Grille Insert Bars, Gooseneck/5th Wheel Prep Package, HD Surround Vision, Heated 2nd Row Outboard Seats, Heated Driver & Front Outboard Passenger Seats, Hill Descent Control, Inside Rearview Auto-Dimming Rear Camera Mirror, Keyless Open & Start, LED Cargo Area Lighting, LED Smoked Amber Roof Marker Lamps, Manual Tilt-Wheel/Telescoping Steering Column, Multicolor 15 Diagonal Head-Up Display, OnStar Services Capable, Power Front Passenger Windows w/Express Up/Down, Power Sliding Rear Window w/Defogger, Power Sunroof, Preferred Equipment Group 4SG, Push Button