Some trucks are built for light duty, and some make you feel like you could tow just about anything without thinking twice. The 2026 GMC Sierra 3500HD AT4 clearly belongs in the second category. Finished in bold Sterling Metallic, this heavy-duty pickup delivers rugged styling backed by serious capability. Under the hood, the legendary Duramax 6.6L V8 Turbodiesel provides massive torque and dependable performance for towing, hauling, and demanding work. The AT4 trim adds off-road confidence while still delivering a smooth and controlled ride on the highway. Its a truck built for drivers who need real strength and aren't afraid to use it.

Inside, the Sierra 3500HD AT4 offers a refined cabin with premium leather seating that balances durability with comfort. The interior is designed to handle long workdays while keeping both driver and passengers comfortable mile after mile. Whether you're on the job site or heading out for a long haul, this truck delivers confidence and capability every step of the way. This vehicle also includes the 2-Year/24k Young Auto Group Complimentary Maintenance Plan for added peace of mind. That means two years of complimentary oil changes, complimentary tire rotations, and complimentary safety inspections to help keep your Sierra running strong. Tax, title, and license fees extra. *Disclaimer: Contact dealer for details. Prices do not include additional fees and costs of closing, including government fees, taxes, any finance charges, any dealer documentation fees or any dealer installed accessories. All prices, specifications and availability subject to change without notice. Special internet prices cannot be combined with any other promotion. *Offers and incentives shown may not be available to all customers. Incentives lists are examples of offers available at the time of posting and are subject to change and expiration. Not all incentives can be redeemed together. To take advantage of rebates, incentives and/or financing offers you must take new retail delivery from dealer stock by the expiration date noted. Not all buyers will qualify for all incentives, GM financing or other offers. Restrictions apply. See us for complete details for more information.$500 - Bonus Cash. Exp. 03/31/2026 $500 - Purchase Allowance. Exp. 03/31/2026 Must trade in 2016 or newer with 80,000 miles or less.. Branded/salvage title will not qualify. $2,000 Down Payment Assistance is available Must Finance with GM Financial - OAC. Contact Dealer For Additional Details

Options:

X31 Off-Road Package

7 Speakers

AM/FM radio: SiriusXM with 360L

Bose Premium 7-Speaker Sound System

Premium audio system: Premium GMC Infotainment System

Radio: AM/FM Stereo with Premium GMC Infotainment System

SiriusXM with 360L Trial Subscription

Steering Wheel Audio Controls

Air Conditioning

Automatic temperature control

Electric Rear-Window Defogger

Front dual zone A/C

Rear window defroster

120-Volt Bed Mounted Power Outlet

120-Volt Instrument Panel Power Outlet

Driver Memory

Memory seat

Power driver seat

Power Front Windows with Passenger Express Up/Down

Power steering

Power windows

Push Button Start

Remote keyless entry

Remote Vehicle Starter System

Steering wheel mounted audio controls

Manual Tilt-Wheel/Telescoping Steering Column

Off-Road Suspension

Speed-sensing steering

Traction control

4-Wheel Disc Brakes

ABS brakes

Dual front impact airbags

Dual front side impact airbags

Emergency communication system: OnStar Services capable

Front anti-roll bar

Front wheel independent suspension

Keyless Open and Start

Low tire pressure warning

Occupant sensing airbag

Overhead airbag

Pickup Bed

Brake assist

Electronic Stability Control

Lane Departure Warning System

Exterior Parking Camera Rear

Hill Descent Control

Auto High-beam Headlights

Delay-off headlights

Front fog lights

Fully automatic headlights

Panic alarm

Security system

Unauthorized Entry Theft-Deterrent System

Speed control

2-Speed Active Transfer Case

Heavy-Duty 80 Amp-Hour Battery

Auto-dimming door mirrors

Bumpers: body-color

Heated door mirrors

IntelliBeam Automatic High Beam on/Off

LED Cargo Area Lighting

Power door mirrors

Rear step bumper

Rear Wheelhouse Liners

Spray-on Pickup Bedliner with GMC Logo

Turn signal indicator mirrors

2 Charge-Only Rear USB Ports

2 Charge/Data USB Ports Inside Center Console

2 USB Ports

Auto-dimming Rear-View mirror

Automatic Emergency Braking

Bed View Camera with Two Trailer Camera Provisions

Buckle to Drive

Compass

Driver door bin

Driver vanity mirror

Floor-Mounted Center Console

Following Distance Indicator

Forward Collision Alert

Front Pedestrian Braking

Front reading lights

GMC Premium 13.4" Diagonal Information Display

HD Surround Vision

Heated steering wheel

Illuminated entry

Outside temperature display

Overhead console

Passenger vanity mirror

Premium Front Floor Liners with Removable Carpet Insert

Premium Rear Floor Liners with Removable Carpet Insert

Rear Cross Traffic Alert

Rear reading lights

Rear seat center armrest

Safety Alert Seat

Tachometer

Telescoping steering wheel

Tilt steering wheel

Trailer Camera Provisions

Trailer Side Blind Zone Alert

Trip computer

Ultrasonic Front and Rear Park Assist

Voltmeter

Wireless Charging

Wireless Phone Projection

10-Way Power Driver Seat Adjuster with Lumbar

10-Way Power Passenger Seat Adjuster with Lumbar

Front Bucket Seats

Front Center Armrest

Heated 2nd Row Outboard Seats

Heated Driver and Front Outboard Passenger Seats

Heated front seats

Heated rear seats

Perforated Front Leather Seat Trim

Power passenger seat

Split folding rear seat

Ventilated Driver and Front Passenger Seats

Ventilated front seats

Passenger door bin

Hitch Guidance with Hitch View

Alloy wheels

Wheels: 20" High Gloss Black 8 Spoke Aluminum

Deep-Tinted Glass

Front Rain-Sensing Wipers

Rain sensing wipers

Variably intermittent wipers

3.73 Rear Axle Ratio