Vehicle highlights
- 4WD
- Apple CarPlay
- Android Auto
- Blind Spot Warning
- Backup Camera
- Leather Seating
Price and listing details
Price breakdown
- MSRP
- $90,130
- List price
- $81,741
- Fees, rebates & discounts
- -$4,087
- Advertised price
- $77,654
This is the net difference between the list and advertised prices. It may include fees, rebates, discounts, or other dealer adjustments. Confirm details and eligibility with the dealer.
Mandatory dealer charges are included in this advertised price. The dealer did not provide Car Handshake with an itemized fee breakdown. View the dealer’s listing or contact the dealer for details. Taxes, title, registration, and other government charges are additional.
- Stock number
- 126206
- VIN
- 1GT4UPEY7TF343693
- Seen in inventory
- Listing updated
Confirm availability and transaction details with the dealership.
Specifications
Overview
- Year
- 2026
- Make
- GMC
- Model
- Sierra 2500 HD
- Trim
- AT4
- Condition
- New
- Body
- Pickup
- Mileage
- 5 mi
Engine & drivetrain
- Fuel
- Diesel
- Driveline
- 4WD
- Transmission
- Automatic
- Displacement
- 6600 cc
- Engine
- 6.6L V8
Exterior & interior
- Exterior color
- Black
- Interior color
- Black
Seating and powertrain
- Seats
- Not confirmed
- Third row
- Not confirmed
- Powertrain
- Diesel
Seat count does not confirm a third row. Check unconfirmed details with the dealership.
Features
41 listedSafety
13
- Backup Camera
- Blind Spot Warning
- Forward Automatic Emergency Braking
- Rear Cross Traffic Warning
- Parking Sensors (Front and Rear)
- Lane Departure Warning
Show all 13 featuresShow fewer features
- Surround View Camera
- Forward Collision Warning
- Pedestrian Automatic Emergency Braking
- Cruise Control
- Hill Start Assist
- Rear Seat Reminder
- Hill Descent Control
Comfort & interior
9
- Heated Front Seats
- Remote Start
- Opening Sunroof
- Leather Seating
- Ventilated Front Seats
- Heated Steering Wheel
Show all 9 featuresShow fewer features
- Push Button Start
- Power Driver Seat
- Keyless Entry
Technology
11
- Apple CarPlay
- Android Auto
- Built-in Navigation
- Wireless Phone Charging
- Head-up Display
- Bluetooth
Show all 11 featuresShow fewer features
- USB Ports
- Satellite Radio
- Touchscreen Display
- Voice Control
- Digital Instrument Cluster
Exterior & utility
8
- Trailer Hitch
- Trailer Brake Controller
- Alloy Wheels
- Fog Lights
- Rain-Sensing Wipers
- Heated Mirrors
Show all 8 featuresShow fewer features
- Tinted Windows
- Trailer Sway Control
Dealer notes
This new 2026 GMC Sierra 2500HD AT4 crew cab with a standard bed and four-wheel drive is on the lot at Napleton Buick GMC in Crystal Lake — a heavy-duty truck built around the idea that going off the pavement and hauling serious weight are not mutually exclusive. It arrives in Onyx Black, a deep gloss finish, over a Jet Black perforated leather interior with Kalahari accents.
At a glance: Duramax 6.6L turbo-diesel V8 · 10-speed automatic · 4WD · crew cab / standard bed · delivery miles only · Onyx Black exterior · Jet Black with Kalahari accents interior
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The X31 Off-Road Package is the foundation here, paired with LT275/65R20 all-terrain blackwall tires on 20-inch high-gloss black aluminum wheels and a 2-speed active transfer case. Add the Preferred Equipment Group 4SB's spray-on bedliner with GMC logo, LED cargo area lighting, 120-volt bed-mounted power outlet, and rear wheelhouse liners, and the AT4 is as ready for a work day as it is for a trail run.
Off-road high-clearance steps — part of the AT4 Premium Plus Package — make entry and exit practical when the terrain gets rough, and front and rear molded splash guards in black keep the rocker panels clean.
The trailering suite goes well beyond a hitch. The ProGrade Trailering System includes HD surround vision, a bed view camera with two trailer camera provisions, trailer cam provisions and trailer viewing software, trailer side blind zone alert, and rear cross traffic alert.
The gooseneck/5th-wheel prep package adds a hitch platform for a gooseneck or 5th-wheel connection, and the exhaust brake helps manage loaded descents. A 220-amp alternator supports the electrical demands of a working rig, and the 10-speed automatic keeps the diesel in its powerband whether the bed is empty or stacked.
Inside, the AT4 Premium Plus Package brings a power sunroof and a Technology Package that includes the 13.4-inch diagonal premium GMC infotainment system with Google built-in apps, a multicolor 15-inch diagonal head-up display, and a rear camera mirror. The Preferred Equipment Group adds heated and ventilated front seats, heated second-row outboard seats, wireless charging, a Bose premium 7-speaker sound system, remote vehicle starter, front rain-sensing wipers, keyless open and start, and a power sliding rear window with defogger.
Wireless Apple CarPlay and Android Auto, a mobile hotspot, SiriusXM with 360L trial, and a universal home remote round out the connectivity side. Driver-assistance features include forward collision mitigation, lane keep assist, blind spot monitoring, and ultrasonic front and rear park assist — plus the safety alert seat to deliver warnings without demanding eyes off the road.
An engine block heater comes standard for cold Illinois mornings.
Napleton Buick GMC is at 6305 Northwest Hwy in Crystal Lake, on US-14 near the Metra UP-NW line and convenient to Algonquin, Cary, Carpentersville, and Lakewood. We have been family-owned for more than 80 years and believe the truck should do the talking — our process is straightforward and low-pressure.
If your trailer has been waiting for a truck that can handle it, this AT4 is worth a close look.
Dealership location
Napleton Buick GMC Crystal Lake
Dealer: Napleton Autos
6305 Northwest Highway, Crystal Lake, IL, 60014
