2026 GMC Sierra 1500 AT4 Overview

The 2026 GMC Sierra 1500 offers numerous trim levels designed for different performance needs and lifestyles in San Jose. If you’re a serious outdoor enthusiast, the 2026 GMC Sierra 1500 AT4 or AT4X is the trim for you! With diesel power and trail-worthy equipment, these robust models are ready for wild off-road adventures as soon as you secure the keys. Learn more about the AT4 and AT4X with Capitol GMC below! 

2026 GMC Sierra 1500 AT4 And AT4X: Feature Highlights

Whether you’re driving to a job in Fremont or gearing up for a weekend adventure outside Santa Clara, you’ll enjoy powerful performance and access to many features in the AT4 or AT4X. Check out some standard and available features for both trims:

GMC Sierra 1500 AT4

Key Standard Features: 

• Duramax® 3.0L Turbo-Diesel engine with 10-speed automatic transmission
• 2-inch factory lift with off-road suspension and Rancho® monotube shocks 
• Two-speed Autotrac® transfer case and underbody skid plates
• Unique Jet Black interior with Kalahari accents and heated and ventilated perforated front leather seating surfaces 

Key Available Features: 

• 15-inch diagonal multicolor Head-Up Display
• 6.2L V8 engine with 10-speed automatic transmission

GMC Sierra 1500 AT4X

Key Standard Features (Includes AT4 Standard Features, Plus Adds Or Substitutes):

• Front and rear electronic locking differentials
• Multimatic DSSV dampers    
• AEV stamped steel front bumper with front winch capability and stamped boron steel front approach AEV skid plate
• 16-way power heated and ventilated front seats with massage feature

Key Available Features: 

• AT4X AEV Edition
• 6.2L V8 engine with 10-speed automatic transmission

2026 GMC Sierra 1500 AT4 And AT4X Available Packages

If you want to customize your new diesel truck, check out some of our favorite packages. These options are available for the GMC Sierra 1500 AT4X and AT4: 

Cargo Convenience Package

• Rear under-seat storage
• Console-Mounted Safe

GMC Protection Package

• All-weather floor liner
• Front and rear Black molded splash guards

Max Trailering Package

• Trailering Package
• Increased towing and GCWR
• Automatic locking rear differential
• Handling/Trailering Suspension Package
• Enhanced cooling radiator
• Revised shock tuning
• Heavier-duty rear springs and increased RGAWR
• 9.76-inch rear axle
• Trailer brake controller

Sierra Safety Plus Package

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

Preferred Package

• Universal Home Remote
• Rear sliding power window
• Hitch Guidance with Hitch View
• In-vehicle Trailering App
• Adaptive Cruise Control
• Rear wheelhouse liners

Test-Drive The GMC Sierra 1500 AT4 Or AT4X In San Jose

Are you already planning the first off-road excursion in your new GMC Sierra 1500 AT4X or AT4? Don’t wait to value your trade and browse our new vehicle specials so you can start your truck upgrade at Capitol GMC! Our team can’t wait to get you behind the wheel of one of these rugged GMC Sierra 1500 configurations.