CASPER GMC CADILLAC · Casper, WY

2026 GMC Sierra 2500 HD AT4

0 miles · truck

1 / 17 photos

PUBLISHED DEALER DETAILS

Complete vehicle specifications

Year2026

MakeGMC

ModelSierra 2500 HD

TrimAT4

VIN1GT4UPEY4TF399672

Stock numberG7518

BodyPickup

Engine6.6L V8 turbo

Cylinders8

Displacement6.6L

Horsepower470

TransmissionAutomatic

Drivetrain4WD

FuelDiesel

ExteriorOnyx Black

InteriorJet Black with Kalahari accents, Perforated Front

Doors4

Towing20000

Vehicle description

Vehicle Details Discover the capability and refinement of the 2026 GMC Sierra 2500 AT4, a heavy-duty pickup built for drivers who demand serious strength with premium comfort. Equipped with 4WD and a robust V8 6.6L Diesel engine, this GMC Sierra 2500 AT4 is engineered for confident towing, hauling, and off-road performance. The AT4 trim adds bold styling, aggressive stance, and the Off-Road Package for enhanced traction and durability when the pavement ends. Inside, this GMC Sierra 2500 delivers a well-appointed cabin designed for daily productivity and long-distance comfort. Stay connected with Apple CarPlay, enjoy crisp audio from the BOSE Stereo, and take advantage of the Heated Steering Wheel during cold Wyoming mornings. A Back-Up Camera adds extra confidence when parking, trailer maneuvering, or navigating tight spaces. Whether you need a dependable work truck or a premium adventure-ready pickup, the 2026 GMC Sierra 2500 AT4 offers the power, technology, and capability to handle demanding jobs with ease. With rugged 4WD performance, advanced features, and a driver-focused interior, this diesel-powered GMC is ready for life in Casper, WY and beyond. Visit today to experience the strength and sophistication of this impressive heavy-duty truck. Perfect for ranch work, construction projects, weekend towing, and mountain travel, it blends capability with premium comfort while standing out with unmistakable AT4 attitude and GMC engineering in demanding conditions all around. Equipment This unit's Lane Departure Warning keeps you safe by alerting you when you drift from your lane. See what's behind you with the back up camera on this vehicle. It is equipped with the latest generation of XM/Sirius Radio. Apple CarPlay: Seamless smartphone integration for the GMC Sierra - stay connected and entertained on the go! It offers Android Auto for seamless smartphone integration. This 3/4 ton pickup warns of approaching vehicles with Cross-Traffic Alert. Bluetooth technology is built into this vehicle, keeping your hands on the steering wheel and your focus on the road. The leather seats in this unit are a must for buyers looking for comfort, durability, and style. Engulf yourself with the crystal clear sound of a BOSE sound system in it. The steering wheel audio controls on this 2026 GMC Sierra 2500 keep the volume and station within easy reach. This vehicle has auto-adjust speed for safe following. Packages Max Trailering Package: 11. 750 lbs (5. 330 Kg) GVWR; Gooseneck/5th Wheel Prep 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-On

Features & options (174)

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
Assist handle, side
Black Sport steps
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
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
Upfitter switches
Ventilated driver and front passenger seats
Wireless Charging
Wrapped steering wheel
10-speed automatic transmission
11,750 lbs. GVWR
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
Dual, 220 amp primary and 170 auxiliary amp alternators
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
High idle switch
Hill Descent Control
In-Vehicle Trailering App
Integrated trailer brake controller
Off-Road suspension
Pickup bed
Push Button Start
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
Max Trailering Package:
3500 HD Frame
3500 HD Leaf Springs
12" Rear axle
3500 HD Shock Package
Gooseneck / 5th Wheel Prep provisions
Bed stamped holes with caps installed
ProGrade Trailering System:
Hitch Guidance with Hitch View
Sierra HD Pro Safety:
Technology Package:
Multi-color 15" Diagonal Head-Up Display
AT4 Preferred Package on AT4
May require additional optional equipment
Trailering Package:
Trailer hitch
Trailering hitch platform
X31 Off-Road Package:
Twin-tube Rancho shocks
AT4 Preferred Package
Max Trailering Package
ProGrade Trailering System
Sierra HD Pro Safety
Technology Package
Trailering Package
X31 Off-Road Package
In-vehicle Trailering App

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 250 miles of Casper, Wyoming

Asking price$84,295Dealer asking price

Market value$84,023Market value · based on 46 comparable cars

vs. market Fair price+0.3%Fair price · based on 46 comparable cars

Where this price sits

In the typical middle range · 50% of 46 similar listings ask more than this car.

Market value $84,023

This car$84,295

$76,295lowest$89,211highest

Middle 50% of asking pricesMarket valueThis car

Price vs. market value

−25%Market value+25%

Fair price$272 above the market value of $84,023

Price range

$76,295$89,211

24th lowest price of 47 similar listings within 250 milesTick marks the market value · range of 46 similar listings

AutosXchange Insights

Compared with 46 new 2026 GMC Sierra 2500 AT4 listings within 250 mi.
Priced $272 above the market value of 46 comparable cars — compare options, condition and history.
24th lowest price of 47 similar listings within 250 miles.
Stock # G7518 — 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 8, 2026. No price change at this dealership since Nov 8 ($84,295).

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

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 250 miles of Casper, Wyoming. Showing the 12 nearest of 46 comparable cars for sale, nearest first.

2026 GMC Sierra 2500 HD AT4 for sale at CASPER GMC CADILLAC in Casper, WY

Fair price

18 photos