O'Meara GMC · Thornton, CO

2026 GMC Sierra 2500 HD AT4

13 miles · truck · Price dropped $2,000

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PUBLISHED DEALER DETAILS

Complete vehicle specifications

Year2026

MakeGMC

ModelSierra 2500 HD

TrimAT4

VIN1GT4UPEY4TF399493

Stock numberTF399493

Mileage13 miles

BodyPickup

Engine6.6L V8 turbo

Cylinders8

Displacement6.6L

TransmissionAutomatic

Drivetrain4WD

FuelDiesel

ExteriorCoastal Dune

InteriorJet Black with Kalahari accents, Perforated Front

Doors4

Vehicle description

Heated Leather Seats, Navigation, Heated Rear Seat, 4x4, Bed Liner, Trailer Hitch, LPO, 20" (50.8 CM) HIGH GLOSS BLACK PAINTED WHEELS, 3 YEARS SIRIUSXM. Coastal Dune exterior and Jet Black with Kalahari accents interior, AT4 trim. KEY FEATURES INCLUDE Leather Seats, 4x4, Heated Driver Seat, Heated Rear Seat, Cooled Driver Seat, Premium Sound System, Onboard Communications System, Trailer Hitch, Remote Engine Start, Dual Zone A/C Keyless Entry, Privacy Glass, Steering Wheel Controls, Alarm. GMC AT4 with Coastal Dune exterior and Jet Black with Kalahari accents interior features a 8 Cylinder Engine with 470 HP at 2800 RPM*. OPTION PACKAGES ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE (470 hp [350.5 kW] @ 2800 rpm, 975 lb-ft of torque [1322 Nm] @ 1600 rpm) (Includes (K05) engine block heater.), AT4 PREMIUM PLUS PACKAGE includes (PDO) AT4 Preferred Package, (CF5) power sunroof, (CWM) Technology Package and (VXW) AT4 high clearance step, LPO, LPO, 20" (50.8 CM) HIGH GLOSS BLACK PAINTED WHEELS LPO wheels will come with 4 aluminum 20" Transit Wheels from the factory with alignment specs set to 20" LPO wheel selected (dealer-installed), MAX TRAILERING PACKAGE includes 3500 HD Frame, 3500 HD Leaf Springs, 12" Rear axle, 3500 HD Shock Package, (CGN) spray-on bed liner and (Z6A) Gooseneck / 5th Wheel Prep provisions with bed stamped holes and caps, TECHNOLOGY PACKAGE includes (DRZ) Rear Camera Mirror and (UV6) Multicolor 15" Diagonal Head-Up Display, AT4 PREFERRED PACKAGE includes (UG1) Universal Home Remote, (A48) rear sliding power window and (U01) Roof Marker Lamps, 3 YEARS SIRIUSXM, AUDIO SYSTEM, 13.4" DIAGONAL PREMIUM GMC INFOTAINMENT SYSTEM WITH GOOGLE BUILT IN APPS SUCH AS NAVIGATION AND VOICE ASSISTANCE includes color touch-screen, multi-touch display, AM/FM stereo, BluetoothÂ® streaming audio for music and most phones; featuring wireless Android AutoÂ® and Apple CarPlayÂ® capability for compatible phones (STD), TRANSMISSION, 10-SPEED AUTOMATIC.

Features & options (153)

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
3 Years SiriusXM
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" High gloss Black painted wheels
20" LT275/65R20 all-terrain, blackwall tires
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 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
11,750 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
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
AT4 Premium Plus Package
Heavy Duty Front Spring / Camper Package
Max Trailering Package
ProGrade Trailering System
Sierra HD Pro Safety
Technology Package
Trailering Package
X31 Off-Road 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 Thornton, Colorado

Asking price$89,056Dealer asking price · 13 mi

Market value$82,429Market value · based on 34 comparable cars

vs. market High price+8.0%High price · based on 34 comparable cars

Where this price sits

Among the highest-priced · 3% of 34 similar listings ask more than this car.

Market value $82,429

This car$89,056

$76,295lowest$89,211highest

Middle 50% of asking pricesMarket valueThis car

Price vs. market value

−25%Market value+25%

High price$6,627 above the market value of $82,429

Price range

$76,295$89,211

34th lowest price of 35 similar listings within 50 milesTick marks the market value · range of 34 similar listings

AutosXchange Insights

Compared with 34 new 2026 GMC Sierra 2500 AT4 listings within 50 mi.
Priced $6,627 above the market value of 34 comparable cars — compare options, condition and history.
34th lowest price of 35 similar listings within 50 miles.
About 13 miles per year of age (U.S. average is roughly 12,000–14,000).
Stock # TF399493 — 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. 1 price change at this dealership: $91,056 → $89,056 (−$2,000).

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

Dealer-advertised asking prices as observed by AutosXchange (data as of Nov 13); 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 Thornton, Colorado. Showing the 12 nearest of 34 comparable cars for sale, nearest first.

2026 GMC Sierra 2500 HD AT4 for sale at O'Meara GMC in Thornton, CO

Fair pricePrice drop −$2,000

6 photos