Vehicle Details
Introducing the rugged and refined 2026 GMC Sierra 2500 AT4, a powerhouse designed for those who demand more from their truck. Beneath its commanding hood lies a formidable V8, 6.6L engine, delivering unmatched power and performance to tackle any challenge the road throws your way. This beast is equipped with 4WD, ensuring you maintain control and confidence whether you're navigating through tough terrains or cruising down the highway. The GMC Sierra 2500 AT4 is engineered with the Off-Road Package, making it the ultimate adventure companion. It boasts superior ground clearance, skid plates, and off-road suspension, allowing you to conquer the wild with ease. Inside, it offers a perfect blend of comfort and cutting-edge technology with Steering Wheel Audio Controls and a premium BOSE Stereo system, providing an immersive auditory experience for every journey. Stay safe and in command with Advanced Driver Assistance features like Adaptive Cruise Control and Lane Departure Warning, ensuring peace of mind on every trip. The 2026 GMC Sierra 2500 AT4 is not just a vehicle; it's a statement of strength and sophistication. Whether you're towing, hauling, or off-roading, this truck is built to exceed expectations, offering an unparalleled driving experience for those who refuse to settle for anything less.
Equipment
See what's behind you with the back up camera on this GMC Sierra. Bluetooth technology is built into this vehicle, keeping your hands on the steering wheel and your focus on the road. Start this model from inside with remote start. An off-road package is equipped on this GMC Sierra. It offers Apple CarPlay for seamless connectivity. The steering wheel audio controls on this vehicle keep the volume and station within easy reach. The leather seats in the GMC Sierra are a must for buyers looking for comfort, durability, and style. This unit comes equipped with Android Auto for seamless smartphone integration on the road. This vehicle has auto-adjust speed for safe following. The GMC Sierra is pure luxury with a heated steering wheel. This vehicle warns of approaching vehicles with Cross-Traffic Alert. The GMC Sierra's Lane Departure Warning keeps you safe by alerting you when you drift from your lane.
Packages
AT4 Preferred Package: Power Sliding Rear Window with Defogger; LED Smoked Amber Roof Marker Lamps; Universal Home Remote. AT4 Premium Plus Package: Power Sunroof; Technology Package. Preferred Equipment Group 4SB: LED Cargo Area Lighting; Trailer Side Blind Zone Alert; SiriusXM with 360L Trial Subscription; Remote Vehicle Starter System; Safety Alert Seat; Ultrasonic Front and Rear Park Assist; Trailer Cam Provisions and Trailer Viewing Software; Electric Rear-Window Defogger; Floor-Mounted Center Console; Gloss Black Header Grille and Grille Insert Bars; Unauthorized Entry Theft-Deterrent System; Bed View Camera with Two Trailer Camera Provisions; Front Rain-Sensing Wipers; Sierra HD Pro Safety; Wireless Phone Projection; 2 USB Ports; Rear Cross Traffic Alert; 120-Volt Instrument Panel Power Outlet; 2 Charge/data USB Ports Inside Center Console; Heated Driver and Front Outboard Passenger Seats; Wireless Charging; X31 Off-Road Package; Front Premium Floor Liners with Removable Carpet Insert; Steering Wheel Audio Controls; Rear Premium Floor Liners with Removable Carpet Insert; 2 Charge-Only Rear USB Ports; OnStar Services Capable; 120-Volt Bed Mounted Power Outlet; He
New 2026 GMCSierra 2500 HD AT4
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black with Kalahari accents, Perforated Front
- Transmission
- Automatic
- Drivetrain
- 4WD
- Engine
- 6.6L Duramax Turbo-Diesel V8 engine
- VIN
- 1GT4UPEY8TF102404
- Stock Number
- HG06007
GMC
Sierra 2500 HD
Included Packages & Accessories
Dealer Notes
KBB.com Consumer Reviews

Overall3.8Out of 5
- 2.0
Transmission trash
By Jason | on Monday, April 07, 2025
Bought a 2023 GMC Duramax diesel Sierra SLT had it for two years hit 50,000 miles. The throttlebody broke went in for service. Got it back three weeks at 62,000 miles now my transmission is slipping. I travel back-and-forth from South Carolina to North Carolina for work daughter’s truck would be my forever truck. What a joke Hundred thousand dollar truck junk… - 5.0
Fantastic truck
By Jjj | on Sunday, November 07, 2021
This one of the most solid vehicles that I have ever driven! The 401 hp engine is more than enough power and the transmission is smooth! Highly recommend this truck!… - 3.0
Don't judge a truck by the appearance
By jmil | on Wednesday, May 11, 2022
Great truck, loved it until the DEF tank heater malfunctioned and shut down the truck. Now sitting waiting for the replacement tank for over 10 weeks. Turns out every HD truck 2020 and 2021 has the same problem and all will need this replacement that is being produced at a snail's pace by GM. Per the dealership, last count, over 9000 trucks like mine are idle waiting for this part. $65000 waste of money and terrible service by GMC (not the local dealership).…
Based on 13 consumer ratings for 2020–2025 models. | Privacy
* MSRP is the Manufacturer's Suggested Retail Price (MSRP) of the vehicle. It does not include any taxes, fees or other charges. Pricing and availability may vary based on a variety of factors, including options, dealer, specials, fees, and financing qualifications. Consult your dealer for actual price and complete details. Vehicles shown may have optional equipment at additional cost.
* The estimated selling price that appears after calculating dealer offers is for informational purposes, only. You may not qualify for the offers, incentives, discounts, or financing. Offers, incentives, discounts, or financing are subject to expiration and other restrictions. See dealer for qualifications and complete details.
* The advertised price does not include sales tax, vehicle registration fees, other fees required by law or finance charges. A doc fee, up to $499, may be added to the price of the vehicle.
* Images, prices, and options shown, including vehicle color, trim, options, pricing and other specifications are subject to availability, incentive offerings, current pricing and credit worthiness.
* In transit means that vehicles have been built, but have not yet arrived at your dealer. Images shown may not necessarily represent identical vehicles in transit to your dealership. See your dealer for actual price, payments and complete details.
- MSRP
- $91,425
- Savings
- -$5,975
- Better Way Price
- $85,450
- $500 Purchase Allowance on this 2026 GMC Sierra 2500 HD modelDetails
- -$500
- Best Price*
- $84,950
- $250 GM Military Offer on this 2026 GMC Sierra 2500 HD modelDetails
- -$250
- $500 GM Military Offer on this 2026 GMC Sierra 2500 HD modelDetails
- -$500
- Conditional Final Price
- $84,200
- We're here to help: (208) 580-7318
NEW
2026 GMC Sierra 2500 HD Truck AT4
Exterior Color: Onyx Black
Interior Color: Jet Black with Kalahari accents, Perforated Front
Vin Number: 1GT4UPEY8TF102404
Stock: HG06007
View this 2026 GMC Sierra 2500 HD Truck AT4 for sale at Mountain Home Auto Ranch near Twin Falls.
- We're here to help: (208) 580-7318




