2026 GMC Sierra 1500 AT4 Buyer’s Guide

What Is the 2026 GMC Sierra 1500 AT4?

The 2026 GMC Sierra 1500 AT4 is a premium off-road truck.

It comes standard with:

• Crew Cab
• Four-wheel drive
• 3.0L Duramax turbo-diesel
• Two-inch factory lift
• Rancho monotube shocks
• Skid plates
• All-terrain tires
• Premium interior
• Advanced trailering technology

The AT4 adds off-road equipment without giving up daily comfort.

2026 Sierra AT4 Engine Options

Engine	Horsepower	Torque	Transmission
3.0L Duramax diesel	305 hp	495 lb.-ft.	10-speed automatic
Available 6.2L V8	420 hp	460 lb.-ft.	10-speed automatic

Standard Duramax Diesel

The 3.0L Duramax turbo-diesel is standard.

It produces:

• 305 horsepower
• 495 lb.-ft. of torque

It is paired with a 10-speed automatic transmission and Electronic Precision Shift.

Available 6.2L V8

A 6.2L V8 is also available.

It produces:

• 420 horsepower
• 460 lb.-ft. of torque

Check the window sticker to confirm which engine is installed.

What Comes Standard on the Sierra AT4?

The AT4 builds on the Sierra SLT. It adds off-road equipment, premium comfort and trailering technology.

Standard Off-Road Equipment

• Four-wheel drive
• AutoTrac two-speed transfer case
• Two-inch factory suspension lift
• Rancho monotube shocks
• Hill Descent Control
• Skid plates
• Heavy-duty air filter
• Engine block heater
• 20-inch all-terrain tires
• Red front recovery hooks

The lifted suspension gives the AT4 more ground clearance than a standard Sierra.

Important: Recovery hooks must never be used to tow another vehicle.

AT4 Exterior Features

The AT4 has a darker and more rugged appearance.

Standard exterior equipment includes:

• High-gloss black grille details
• Body-color front and rear bumpers
• Body-color door handles
• High-gloss black mirror caps
• 20-inch machined-aluminum wheels
• All-terrain tires
• Red recovery hooks
• Dual-outlet exhaust
• Rear CornerStep bumper
• Spray-on bedliner with GMC logo
• GMC MultiPro tailgate
• LED cargo-bed lighting
• 12 cargo tie-downs
• Bed-mounted 120-volt power outlet

Crew Cab Interior

The 2026 Sierra 1500 AT4 is offered as a Crew Cab.

Standard interior features include:

• Front bucket seats
• Center console
• Heated front seats
• Ventilated front seats
• Heated rear outboard seats
• Heated steering wheel
• Power driver and front-passenger seats
• Power lumbar support
• Driver-seat and mirror memory
• Power rake-and-telescoping steering column
• Dual-zone automatic climate control
• Premium front and rear floor liners
• Folding rear bench
• Rear-seat storage system
• Remote start
• Keyless Open and Start

Infotainment and Technology

The Sierra AT4 includes two large dashboard displays.

Standard Technology

• 13.4-inch Premium GMC Infotainment System
• 12.3-inch digital Driver Information Center
• Google built-in compatibility
• Wireless Apple CarPlay
• Wireless Android Auto
• Wireless phone charging
• Bose seven-speaker premium audio system
• Advanced voice recognition
• Personalized driver profiles
• Multiple USB ports

Google built-in services are subject to plan requirements and other limitations.

Standard Trailering Technology

The Sierra AT4 includes the ProGrade Trailering System.

Its features include:

• Hitch View
• In-vehicle trailering app
• Smart Trailer Integration Indicator

The AT4 also includes:

• Trailer brake controller
• Trailer Camera Provisions
• Trailer Side Blind Zone Alert
• 120-volt bed-mounted power outlet

Additional trailering cameras and mirrors are available.

Standard Safety Features

Every Sierra AT4 includes GMC Pro Safety.

GMC Pro Safety

• Automatic Emergency Braking
• Following Distance Indicator
• Forward Collision Alert
• Front Pedestrian Braking
• IntelliBeam automatic high beams
• Lane Keep Assist
• Lane Departure Warning

Sierra Safety Plus

The AT4 also includes Sierra Safety Plus:

• Front and Rear Park Assist
• HD Surround Vision
• Rear Cross Traffic Braking
• Rear Pedestrian Alert
• Safety Alert Seat
• Trailer Camera Provisions
• Trailer Side Blind Zone Alert

Adaptive Cruise Control is also standard.

Safety systems assist the driver. They do not replace careful driving.

Available Sierra AT4 Packages

AT4 Preferred Package

The AT4 Preferred Package adds:

• Power rear-sliding window
• Universal Home Remote

Technology Package

The Technology Package adds:

• 15-inch Head-Up Display
• Bed View Camera
• Rear Camera Mirror

AT4 Premium Package

The AT4 Premium Package includes:

• AT4 Preferred Package
• AT4 high-clearance steps

AT4 CarbonPro Edition

The AT4 CarbonPro Edition requires the AT4 Premium Package.

It includes:

• CarbonPro carbon-fiber composite bed
• MultiPro Audio System by KICKER
• CarbonPro exterior badging

The CarbonPro bed replaces the standard bed and spray-on bedliner configuration.

Other Available AT4 Equipment

Available equipment includes:

• 6.2L V8
• Power sunroof
• Power rear-sliding window
• Rear Camera Mirror
• Head-Up Display
• Bed View Camera
• Vertical trailering mirrors
• Trailer Tire Pressure Monitor Sensors
• Auxiliary Trailer Camera
• 18-inch wheels
• Mud-terrain tires
• High-clearance steps
• Rocker guards
• Sport bar
• Off-road recovery kit
• CarbonPro bed

Equipment may require certain packages or other options.

Who Should Consider the Sierra AT4?

The Sierra 1500 AT4 may fit buyers who want:

• Standard four-wheel drive
• A diesel engine
• A factory suspension lift
• Off-road equipment
• Crew Cab space
• Heated and ventilated seats
• Advanced trailering technology
• Large interior displays
• Premium comfort
• A rugged design with fewer chrome details

Frequently Asked Questions

What engine comes standard in the 2026 Sierra AT4?

The 3.0L Duramax turbo-diesel is standard. It produces 305 horsepower and 495 lb.-ft. of torque.

Is the Sierra AT4 four-wheel drive?

Yes. Four-wheel drive is standard.

Does the Sierra AT4 have a factory lift?

Yes. The AT4 has a standard two-inch factory suspension lift with Rancho monotube shocks.

Is the Sierra AT4 available as a Crew Cab?

Yes. The 2026 Sierra 1500 AT4 is offered as a Crew Cab.

Does the Sierra AT4 have leather seats?

The AT4 has a premium interior with front bucket seats. Review the window sticker for the exact seat material and interior configuration.

Are ventilated seats standard?

Yes. Heated and ventilated front seats are standard. Heated rear outboard seats are also standard.

Does the Sierra AT4 have the MultiPro tailgate?

Yes. The GMC MultiPro tailgate is standard on the AT4.

Does the Sierra AT4 have Adaptive Cruise Control?

Yes. Adaptive Cruise Control is standard.

Does the Sierra AT4 have a Head-Up Display?

The 15-inch Head-Up Display is available through the Technology Package.

How much can the Sierra AT4 tow?

The ordering workbook does not provide one towing figure for every AT4. Capacity depends on the engine and installed equipment. Check the truck’s VIN-specific trailering information before quoting a number.

Shop the 2026 GMC Sierra 1500 AT4 in St. Louis

Browse our current Sierra 1500 AT4 inventory to compare engines, colors and packages.

Always check the window sticker. Standard and available equipment can vary by vehicle.

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