Vehicle Details
Built for hard work and weekend adventure, this 2026 GMC Sierra 2500 AT4 delivers serious capability with refined comfort and bold style. Powered by a V8 6.6L gasoline engine and equipped with 4WD, this heavy-duty pickup is engineered to handle demanding jobs, towing, and off-road terrain with confidence. The AT4 trim adds rugged character, premium features, and the off-road readiness drivers want in a capable full-size truck. Inside, you'll find a well-appointed cabin designed to keep you comfortable and connected on every drive. Remote Start makes getting on the road easier, while the Back-Up Camera and Cross-Traffic Alert help enhance awareness in parking lots and tight spaces. Adaptive Cruise Control supports relaxed highway driving, and Lane Departure Warning adds an extra layer of confidence during longer trips. Whether you need a dependable truck for the worksite or a versatile vehicle for everyday use, the GMC Sierra 2500 AT4 stands out with strength, technology, and premium GMC craftsmanship. This 2026 GMC Sierra 2500 AT4 is located in Breaux Bridge, LA, and is ready for drivers who want capability without compromise. Explore this impressive heavy-duty pickup today and experience the confidence of GMC engineering in a truck built to go further.
Equipment
This 2026 GMC Sierra 2500 features a hands-free Bluetooth phone system. This vehicle's Lane Departure Warning keeps you safe by alerting you when you drift from your lane. Start this unit from inside with remote start. This 2026 GMC Sierra 2500 comes equipped with Android Auto for seamless smartphone integration on the road. The leather seats in this vehicle are a must for buyers looking for comfort, durability, and style. See what's behind you with the back up camera on it. The GMC Sierra offers Apple CarPlay for seamless connectivity. Engulf yourself with the crystal clear sound of a BOSE sound system in this 2026 GMC Sierra 2500. The vehicle has auto-adjust speed for safe following. This vehicle is pure luxury with a heated steering wheel. The GMC Sierra's Cross-Traffic Alert: Safeguarding you from unexpected traffic when reversing. This vehicle has a V8, 6.6L high output engine. When you encounter slick or muddy roads, you can engage the four wheel drive on this vehicle and drive with confidence.
New 2026 GMCSierra 2500 HD AT4
- Exterior Color
- Sterling
- Interior Color
- Jet Black
- Body/Seating
- Truck Crew Cab/5 seats
- Seats
- 5 seats
- Transmission
- 10-speed automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 1GT4UPE74TF405915
- Stock Number
- 26GB5285
Highlighted Features
- Lane departure
- Leather upholstery
- Automatic temperature control
- Emergency communication system
- Power moonroof
- Premium audio system
- Wireless phone connectivity
- Parking sensors
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera right
- Exterior parking camera rear
Included Packages & Accessories
- Federal Emissions Requirements
- 3.73 Rear Axle Ratio
- GVWR: 10,850 lbs
- Engine: 6.6L V8 with Direct Injection and Variable Valve Timing
- Heavy-Duty 80 Amp Battery
- Transmission: 10-Speed Automatic
- AT4 Premium Plus Package
- AT4 Preferred Package
- Universal Home Remote
- Power Sliding Rear Window with Defogger
- LED Smoked Amber Roof Marker Lamps
- Power Sunroof
- Technology Package
- Inside Rearview Auo-Dimming Rear Camera Mirror
- Multicolor 15" Diagonal Head-Up Display
- Off-Road High Clearance Step
- Set of 4 Wheel Locks
Detailed Specifications
- 1-touch down
- 1-touch up
- Adaptive Cruise Control
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Emergency communication system: OnStar
- Front beverage holders
- Front dual zone A/C
- Heated steering wheel
- Illuminated entry
- Memory seat
- Moonroof sunshade: manual
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power moonroof
- Power windows
- Proximity key: doors and push button start
- Rear beverage holders
- Rear door bins
- Remote engine start
- Remote keyless entry
- Speed control
- Surround View Monitor: HD Surround Vision w/Hitch View yes
- Telescoping steering wheel
- Tilt steering wheel
- Alloy wheels
- Front anti-roll bar
- Front tires: 275/65SR20.0E
- Front wheel independent suspension
- Power steering
- Rear tires: 275/65SR20.0E
- Single rear wheels
- Speed-sensing steering
- Tires: all-terrain
- Wheel size: 20"
- 1st row LCD monitors: 2
- AM/FM radio: SiriusXM with 360L
- Premium audio system: Premium GMC Infotainment System
- Primary LCD size: 13.4"
- Satellite radio trial duration with new vehicle purchase (months): 3
- Smart device integration: Apple CarPlay/Android Auto
- Speaker type: Bose
- Speakers: 7
- Steering wheel mounted audio controls
- Turn-by-turn navigation directions: OnStar Turn-by-Turn Navigation
- Wireless Phone Charger: front
- Wireless phone connectivity: Bluetooth
- Basic warranty: 36 months/36,000miles
- Corrosion perforation warranty: 72 months/100,000miles
- Maintenance warranty: 12 months/12,000miles
- Powertrain warranty: 60 months/60,000miles
- Roadside assistance coverage: 60 months/60,000miles
- Front center armrest
- Front seats: bucket
- Heated front seats
- Heated rear seats
- Leather upholstery
- Max seating capacity: 5
- Power 2-way driver lumbar support
- Power 2-way passenger lumbar support
- Power driver seat
- Power passenger seat
- Rear seat center armrest
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: leather
- Split folding rear seat
- Ventilated front seats
- Compressor: Not Available
- Cylinder configuration: V-8
- Drive type: four-wheel
- Electric motor 1 torque: none
- Electric motor horsepower: none
- Engine liters: 6.6L
- Engine location: front
- Fuel tank capacity: 36.0gal.
- Horsepower: 401hp @ 5,200RPM
- Hybrid electric powertrain type: none
- Hybrid system combined power torque: none
- Hybrid system net power: none
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Number of valves: 16
- Rear locking differential
- Recommended fuel: Regular gasoline
- Standard fuel economy fuel type: gasoline
- Torque: 464 lb.-ft. @ 4,000RPM
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 257mm (10.1")
- Auto-dimming door mirrors
- Bedliner
- Bumpers: body-color
- Heated door mirrors
- Hitch Class: IV
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Trailer hitch
- Trailer sway control
- Turn signal indicator mirrors
- Compression ratio: 10.80 to 1
- Curb weight: 3,347kg (7,378lbs)
- Engine bore x stroke: 103.3mm x 98.0mm (4.07" x 3.86")
- Engine displacement: 6.6 L
- Engine torque: 464 lb.-ft. @ 4,000RPM
- Exterior body width: 2,079mm (81.8")
- Exterior height: 2,027mm (79.8")
- Exterior length: 6,369mm (250.8")
- Front headroom: 1,013mm (39.9")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,677mm (66.0")
- GVWR: 4,921kg (10,850lbs)
- Payload: 1,555kg (3,428lbs)
- Rear headroom: 1,019mm (40.1")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 1,102mm (43.4")
- Rear shoulder room: 1,659mm (65.3")
- Towing capacity: 7,257kg (16,000lbs)
- Turning radius: 8.0m (26.3')
- Wheelbase: 4,039mm (159.0")
- Appearance: digital/analog
- Auto high-beam headlights
- Blind spot: Trailer Side Blind Zone Alert warning
- Compass
- Configurable
- Delay-off headlights
- Exterior parking camera cargo
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera rear: HD Rear Vision Camera w/Hitch View yes
- Exterior parking camera right
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Lane departure: Lane Departure Warning warning
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Parking sensors: UltraSonic front and rear
- Rain sensing wipers
- Rear reading lights
- Rear window defroster
- Tachometer
- Trip computer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Brake assist
- Dual front impact airbags
- Dual front side impact airbags
- Electronic stability
- Forward collision: Forward Collision Alert with Automatic Braking mitigation
- Front pedestrian detection: prevention
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Rear collision: Rear Cross-Traffic Alert warning
- Security system
- Tracker system: Stolen Vehicle Assistance
- Traction control
Dealer Notes
KBB.com Consumer Reviews
- 4.0
Great truck , bad mileage
By Dream truck owner on 11/8/2026 8:42:28 PM
This truck has everything you want from a luxury heavy duty truck. The backseat is spacious enough to hold adults on road trips. It's got enough power to tow and haul a trailer fully loaded with wood. Four-wheel drive works spectacularly. All the interior amenities just increase the interior comfort. The seats are fantastic. Two things make it bring it down to a four-star, those are visibility out of the mirrors even with the cameras and fuel mileage which is to be expected with a big V8, just thought maybe even hauling empty, It would be above 16 or 17. All in all fantastic. Comfortable truck, mechanically no issues The infotainment center is a little bit buggy, but that doesn't bother me much. Quick reset and you're good to go - 5.0
Love this Truck!
By Erick on 2/25/2026 11:54:52 AM
Haven't had a problem with it 140k haven't touched it other than fluids and filters! Top of the line,! - 5.0
Fantastic Truck
By TK2Camo on 2/14/2024 1:18:29 PM
Solid and dependable, I still love this truck! Absolutely zero issues. Whether it's load after a home improvement run, pulling the camper into the mountains or across the country, or shifted into 4-wheeldrive...it does its job with excellence.