Brennan Buick GMC · Plattsburgh, NY

2026 GMC Sierra 2500 HD AT4

1 miles · truck

1 / 41 photos

PUBLISHED DEALER DETAILS

Complete vehicle specifications

Year2026

MakeGMC

ModelSierra 2500 HD

TrimAT4

VIN1GT4UPEY8TF267627

Stock number260169

Mileage1 miles

BodyPickup

Engine6.6L V8 turbo

Cylinders8

Displacement6.6L

Horsepower470

TransmissionAutomatic

Drivetrain4WD

FuelDiesel

ExteriorSummit White

InteriorJet Black with Kalahari accents, Perforated Front

Doors4

Towing18500

Vehicle description

At Brennan Buick GMC, we're here for you throughout the life of your vehicle. If you're in the market for a new or used truck, SUV, or car, visit our dealership to see the best that Brennan Buick GMC has to offer. - Duramax 6.6L V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque - 10-Speed Automatic transmission with 4WD - Multicolor 15 Diagonal Head-Up Display - Power Sunroof - Power Sliding Rear Window with Defogger - 220-Amp Alternator - AT4 Preferred Package and AT4 Premium Plus Package - Gooseneck/5th Wheel Prep Package for advanced towing capability - Technology Package with premium infotainment - Snow Plow Prep/Camper Package - Bose Premium 7-Speaker Sound System with SiriusXM 360L Trial Subscription - Wireless Phone Projection with Apple CarPlay and Android Auto - HD Surround Vision with Bed View Camera and Trailer Camera Provisions - Off-Road Suspension with 2-Speed Active Transfer Case - X31 Off-Road Package with Hill Descent Control The 2026 GMC Sierra 2500HD AT4 is engineered for capability and confidence. Under the hood sits the legendary Duramax 6.6L V8 Turbodiesel engine, delivering an impressive 975 lb-ft of torque that handles demanding workloads with authority. The 10-speed automatic transmission paired with genuine 4WD ensures smooth power delivery across any terrain, while the engine block heater and B20-diesel compatibility provide year-round reliability and flexibility. Built for serious work and adventure, this Sierra 2500HD comes equipped with the Gooseneck/5th Wheel Prep Package and Snow Plow Prep/Camper Package, making it ready for whatever you tow or haul. The off-road suspension with hill descent control and the X31 Off-Road Package demonstrate GMC's commitment to versatile performance. Advanced technology like the HD Surround Vision system and trailer camera provisions give you complete visibility and confidence when navigating tight spaces or managing heavy loads. Inside, the AT4 Premium Plus Package elevates your driving experience with heated and ventilated front seats, a heated steering wheel, and a power sunroof that brings the outdoors in. The Multicolor 15 Head-Up Display keeps critical information visible without distraction, while the technology package integrates wireless phone projection, Apple CarPlay, and Android Auto seamlessly into your journey. The Bose premium sound system and SiriusXM trial subscription transform every drive into an enjoyable experience. Safety and convenience combine throughout this truck. Automatic emergency braking, front pedestrian braking, and a comprehensive airbag system work to protect you and your passengers. Remote vehicle start, keyless open and start, and push-button ignition add modern convenience, while ultrasonic front and rear park assist removes guesswork from tight parking situations. The wireless charging capability and multiple USB ports keep your devices powered and connected. This white 2026 Sierra 2500HD AT4 represents the pinnacle of heavy-duty truck engineering, combining raw capability with refined comfort. Whether you need a workhorse for demanding tasks or a capable companion for weekend adventures, this truck delivers on every front. We invite you to experience it firsthand at our dealership and discover why the Sierra 2500HD remains the choice for those who refuse to compromise. Price includes: $2000 - Bonus Cash. Exp. 11/30/2026 $2500 - Purchase Allowance. Exp. 11/30/2026

Features & options (155)

Basic
Corrosion
Maintenance
Roadside Assistance
Max seating capacity
Fuel System
Fuel tank capacity
Horsepower
Towing capacity
13.4" diagonal GMC Premium Infotainment System with Google built-in
Bluetooth
Bose Premium Sound System
SiriusXM with 360L Trial Subscription
Wi-Fi Hotspot capable
Wireless phone projection
18" LT275/70R18 all-terrain, blackwall spare tire
20" LT275/65R20 BF Goodrich off-road T/A K blackwall tires
20" high gloss Black aluminum wheels
Animated LED Signature Tail lamps with Stop, turn and Reverse lamps
Animated LED projectors headlamps with LED turn signals and Daytime Running Lamps
Black beltline moldings
Body-color door handles
Body-color front bumper
Body-color rear bumper
Cab-mounted cargo area lamps
Cargo bed LED lighting
Cargo tie-downs
CornerStep rear bumper
Deep-tinted glass
Front license plate bracket
GMC MultiPro Tailgate
High gloss Black mirror caps
IntelliBeam
LED fog lamps
Off-Road High Clearance Steps
Outside power-adjustable vertical trailering mirrors with power folding/extending auto-dimming driver and passenger upper glass
Power sunroof
Rainsense automatic wipers
Rear wheelhouse liners
Side Bed Step
Smoked Amber LED roof marker lamps
Spare tire carrier lock
Spray-on bedliner
Tailgate and bed rail protection caps
Tailgate with EZ Lift assist, power lock & release
Winter Grille Cover
10-way power driver seat with power lumbar
10-way power front passenger seat
12.3" diagonal color Driver Information Center
120-volt box-mounted power outlet
120-volt power outlet
Adaptive Cruise Control
Assist handles
Carpeted floor covering
Compass
Driver memory
Dual-zone automatic climate control
Front bucket seats
Front center console
Head-Up Display
Heated driver and front outboard passenger seats
Heated rear outboard seats
Heated steering wheel
Inside rearview auto-dimming mirror
Keyless Open and Start
Manual tilt and telescoping steering column
Outside temperature display
Power door locks
Power sliding rear window with rear defogger
Power windows with driver and front passenger express-up/down
Power windows with driver express-up/down
Power windows with rear express-down
Premium front floor liners with removable carpet insert
Premium rear floor liners with removable carpet insert
Rear Camera Mirror
Rear Seat Reminder
Rear air vents
Rear window defogger
Remote Start
Steering-wheel mounted controls
Theft-deterrent unauthorized entry system
USB ports
Universal Home Remote
Up-level rear seat with storage package
Ventilated driver and front passenger seats
Wireless Charging
Wrapped steering wheel
10-speed automatic transmission
11,350 lbs. GVWR
220-amp alternator
3.42 rear axle ratio
4-wheel antilock disc brakes
6.6L Duramax Turbo-Diesel V8 engine
Air filtration monitoring
Automatic locking rear differential
Autotrac 2-speed transfer case with push button controls
Brake pad wear indicator
Capped fuel fill
Diesel exhaust brake
Digital Variable Steering Assist
Engine block heater
External auxiliary transmission oil cooler
External engine oil cooler
Fully boxed frame
Gooseneck / 5th Wheel Prep Package
Heavy-Duty Air Filter
Heavy-duty dual batteries with 1460 cold-cranking amps
Hill Descent Control
In-Vehicle Trailering App
Integrated trailer brake controller
Off-Road suspension
Red vertical recovery hooks
Skid plates
LED Daytime Running Lamps
Signature LED Daytime Running Lamps
6 airbags
Bed View Camera
Buckle to Drive
Following Distance Indicator
Forward Collision Alert
Front and Rear Park Assist
HD Surround Vision
Hitch Guidance
Hitch View
Lane Departure Warning
OnStar Basics
OnStar services capable
Rear Cross Traffic Alert
Rear Seat Belt Indicator
Safety Alert Seat
Seat Belt Adjustable Guide Loops
Teen Driver
Tire Pressure Monitoring System with Tire Fill Alert
Trailer Side Blind Zone Alert
Trailering Information Label
Trailering camera provisions
Automatic Emergency Braking
Front Pedestrian Braking
StabiliTrak, electronic stability control system with traction control
AT4 Preferred Package:
Rear sliding power window
LED roof marker lamps
AT4 Premium Plus Package:
Technology Package
AT4 high clearance step
May require additional optional equipment
Snow Plow Prep / Camper Package:
Power feed to accommodate a backup and roof emergency light
A single 220-amp alternator
Heavy-duty front springs
Multi-color 15" Diagonal Head-Up Display
AT4 Preferred Package on AT4
AT4 Preferred Package
AT4 Premium Plus Package
Snow Plow Prep / Camper Package

Dealer-provided information may change. Confirm availability, price, vehicle condition, taxes and fees with the selling dealership.

AutosXchange Intel

Vehicle price analysis

Live listings · within 50 miles of Plattsburgh, New York

Asking price$79,185Dealer asking price · 1 mi

Market value$78,258Market value · based on 16 comparable cars

vs. market Fair price+1.2%Fair price · based on 16 comparable cars

Where this price sits

In the typical middle range · 31% of 16 similar listings ask more than this car.

Market value $78,258

This car$79,185

$74,817lowest$85,180highest

Middle 50% of asking pricesMarket valueThis car

Price vs. market value

−25%Market value+25%

Fair price$927 above the market value of $78,258

Price range

$74,817$85,180

12th lowest price of 17 similar listings within 50 milesTick marks the market value · range of 16 similar listings

AutosXchange Insights

Compared with 16 new 2026 GMC Sierra 2500 AT4 listings within 50 mi.
Priced $927 above the market value of 16 comparable cars — compare options, condition and history.
12th lowest price of 17 similar listings within 50 miles.
About 1 miles per year of age (U.S. average is roughly 12,000–14,000).
Stock # 260169 — mention it when you call or text.

How we calculate market value: comparable cars for sale now plus their last listed prices.

Price history

Price tracked by AutosXchange since Nov 9, 2026. No price change at this dealership since Nov 9 ($79,185).

AutosXchange Intel Hub: Price changes for this model in New York · This model in the Intel Hub · Market movers in New York

Dealer-advertised asking prices as observed by AutosXchange (data as of Nov 12); earlier listings at other dealerships are shown by state only. Source: AutosXchange Intel Hub, autos-xchange.com/market.

Cars this price is compared to

Same 2026 Sierra 2500 AT4 · new · within 50 miles of Plattsburgh, New York. Showing the 12 nearest of 16 comparable cars for sale, nearest first.

2026 GMC Sierra 2500 HD AT4 for sale at Brennan Buick GMC in Plattsburgh, NY

Fair price

26 photos