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2025 GMC Sierra HD AT4 OVERVIEW

2025 GMC Sierra HD AT4 in McDonough

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6.6L V8 Gas engine
Allison® 10-speed automatic transmission
Remote Keyless Entry
Automatic Emergency Braking

2025 GMC Sierra HD AT4 MODELS

Sierra HD AT4
Sierra HD AT4 AT4X

GMC Sierra HD AT4 Dealer in McDonough

2025 GMC Sierra HD AT4 PERFORMANCE

DURAMAX 6.6L TURBO-DIESEL V8 ENGINE

Sierra Heavy Duty’s available Duramax 6.6L Turbo-Diesel V8 engine features an efficient turbocharger and Allison 10-speed automatic transmission.

AT4 OFF-ROAD READINESS

AT4 features an off-road suspension with twin-tube Rancho shocks, skid plates and Hill Descent Control, which uses antilock braking to help you maintain control.

PROGRADE® TRAILERING TECH

This advanced suite of available intelligent technologies helps streamline the hitching and towing process with integrated tools that help enhance your sense of confidence and visibility.

2025 GMC Sierra HD AT4 APPEARANCE

AT4 GRILLE

Stand out with AT4’s bold front-facing exterior design and LED projector headlamps with animated sequences.

20" AT4 WHEELS

Sierra HD AT4’s 20" gloss-black aluminum wheels with available BFGoodrich off-road tires are made for rough trails.

SPRAY-ON BEDLINER

Help protect the bed and enhance its style with durable cargo bed protection featuring a GMC logo.

2025 GMC Sierra HD AT4 COMFORT

AT4X EXCLUSIVE OBSIDIAN RUSH INTERIOR

AT4X’s interior features authentic Vanta Ash wood, and seats include bold red and white double-needle stitching for athletic character.

PREMIUM ALL-WEATHER FLOOR LINERS

Help protect your interior with available floor liners with removable carpet inserts.

PREMIUM GMC INFOTAINMENT SYSTEM*

With available Google built-in compatibility,* this system offers a helpful, personalized and seamless way to enhance the entertainment in your truck.

2025 GMC Sierra HD AT4 SAFETY & WARRANTY

PRO GRADE PROTECTION

Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:

3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
5-year / 60,000-mile Powertrain Limited Warranty
5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
3-year / 36,000-mile Corrosion Protection
6-year / 100,000-mile Rust-Through Protection
First maintenance visit

REAR PARK ASSIST

Rear Park Assist* can provide distance alerts to nearby detected objects behind your vehicle to help you park and avoid collisions when you’re in Reverse at low speeds.

*Feature will not function on certain models without dealer retrofit; see dealer for details.

BLIND ZONE STEERING ASSIST

Blind Zone Steering Assist can provide a brief, firm turn of the steering wheel when a potential collision is detected with a moving vehicle in the lane you’re entering.

FORWARD COLLISION ALERT

Forward Collision Alert can warn you if it detects a potential front-end collision with a vehicle you’re following so you can quickly take action. It can also provide a tailgating alert if you’re following a vehicle much too closely.

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2025 GMC Sierra HD AT4 OVERVIEW

2025 GMC Sierra HD AT4 in McDonough

2025 GMC Sierra HD AT4 MODELS

Sierra HD AT4

Sierra HD AT4 AT4X

GMC Sierra HD AT4 Dealer in McDonough

2025 GMC Sierra HD AT4 PERFORMANCE

DURAMAX 6.6L TURBO-DIESEL V8 ENGINE

AT4 OFF-ROAD READINESS

PROGRADE® TRAILERING TECH

2025 GMC Sierra HD AT4 APPEARANCE

AT4 GRILLE

20" AT4 WHEELS

SPRAY-ON BEDLINER

2025 GMC Sierra HD AT4 COMFORT

AT4X EXCLUSIVE OBSIDIAN RUSH INTERIOR

PREMIUM ALL-WEATHER FLOOR LINERS

PREMIUM GMC INFOTAINMENT SYSTEM*

2025 GMC Sierra HD AT4 SAFETY & WARRANTY

PRO GRADE PROTECTION

REAR PARK ASSIST

BLIND ZONE STEERING ASSIST

FORWARD COLLISION ALERT

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