When it comes to heavy-duty off-road trucks, few names command as much respect as the GMC Sierra HD. For 2024, GMC has taken its rugged Sierra 2500HD AT4X and partnered with American Expedition Vehicles (AEV) to create an even more capable and adventure-ready truck—the Sierra HD AT4X AEV Edition.
This special edition builds on the already impressive AT4X trim, incorporating AEV’s legendary off-road enhancements, including steel bumpers, skid plates, and larger 35-inch tires, making it one of the most off-road-ready heavy-duty trucks in its class. But unlike many hardcore off-roaders, this truck doesn’t compromise on comfort and technology. It blends raw power, premium interior features, and serious off-road capabilities, making it an enticing option for both adventure seekers and heavy-duty truck enthusiasts.
In this review, we put the 2024 GMC Sierra HD AT4X AEV to the test, breaking down its design, performance, off-road capability, interior luxury, and overall value to see if it lives up to its rugged reputation. Whether you're looking for a truck to tackle extreme terrains or simply want a powerhouse with luxury appointments, this in-depth analysis will help you determine if the Sierra HD AT4X AEV is the right fit for your needs.
Exterior and Design
The 2024 GMC Sierra HD AT4X AEV makes an immediate impression with its bold and aggressive styling, designed to handle extreme off-road conditions while maintaining the premium appeal that GMC is known for. This truck is built on the Sierra 2500HD AT4X platform but gains significant enhancements from American Expedition Vehicles (AEV), making it even more capable and adventure-ready.
Rugged and Functional Design
GMC and AEV have ensured that every aspect of the Sierra HD AT4X AEV’s design serves a purpose. The front and rear bumpers are crafted from hot-stamped boron steel, providing increased durability and impact resistance—an essential upgrade for off-roaders tackling rocky or uneven terrain. These bumpers also feature integrated recovery points and a front winch mounting option, further emphasizing the truck’s overlanding potential.
One of the most striking additions is the AEV-exclusive badging and branding, which signifies this truck’s special status. You’ll find AEV logos embossed on the headrests, floor liners, and tailgate, reinforcing its unique identity.
Increased Ground Clearance and Suspension Upgrades
To enhance off-road capability, the Sierra HD AT4X AEV comes equipped with a 1.5-inch suspension lift, improving ground clearance and approach/departure angles. Combined with Multimatic DSSV dampers, this lift gives the truck a commanding stance while ensuring better articulation and stability over rough terrain.
The massive 35-inch Goodyear Wrangler Territory MT tires wrapped around 18-inch AEV Salta aluminum wheels offer increased traction and durability. These tires are specifically chosen to handle mud, rocks, sand, and snow while maintaining road comfort. The fender flares help accommodate the larger tires while adding to the truck’s aggressive appearance.
Protection and Practicality
Off-roading can be tough on a vehicle, but the AEV package includes several protective features:
- Heavy-duty skid plates made of boron steel, covering the engine, transfer case, and fuel tank
- Reinforced rocker panel protection to shield the truck’s underbody from damage
- High-clearance bumpers designed to improve approach and departure angles
These elements make the Sierra HD AT4X AEV one of the toughest factory-built off-road trucks available, capable of handling everything from rocky trails to deep water crossings.
Lighting and Exterior Finishes
GMC has equipped the truck with LED headlights, fog lights, and taillights, ensuring maximum visibility in low-light conditions. The signature C-shaped LED daytime running lights add a modern touch, while the bold front grille with blacked-out accents enhances its tough aesthetic.
The truck’s body is available in several rugged color options, including Summit White, Onyx Black, and Titanium Rush Metallic, each complementing the aggressive styling and off-road persona.
Powertrain and Performance
The 2024 GMC Sierra HD AT4X AEV is not just about rugged looks—it packs serious power under the hood to match its extreme off-road capabilities. With two powerful engine options, a robust transmission, and a finely tuned suspension system, this truck is built to handle everything from towing heavy loads to conquering rough terrains with ease.
Engine Options: Power Meets Capability
The Sierra HD AT4X AEV is available with two distinct engine choices, catering to different driving needs:
6.6-Liter V8 Gas Engine
- Power Output: 401 horsepower
- Torque: 464 lb-ft
- Transmission: 10-speed automatic
- Fuel Type: Gasoline
This naturally aspirated 6.6-liter V8 is a solid choice for those who want a dependable powertrain with strong towing capacity and smooth power delivery. While it doesn’t deliver the extreme torque of the diesel engine, it still provides ample power for off-road adventures and hauling.
6.6-Liter Duramax Turbo-Diesel V8
- Power Output: 470 horsepower
- Torque: 975 lb-ft
- Transmission: 10-speed automatic Allison®
- Fuel Type: Diesel
For those looking for maximum power and torque, the 6.6-liter Duramax turbo-diesel V8 is the way to go. With a staggering 975 lb-ft of torque, this engine provides effortless towing and exceptional low-end power, making it ideal for off-roading, rock crawling, and heavy hauling.
The Duramax diesel is paired with the Allison 10-speed automatic transmission, which is engineered for smooth shifts and optimal power delivery, whether on the highway or deep in the trails.
Transmission: 10-Speed Automatic for Both Powertrains
Regardless of which engine you choose, the 10-speed automatic transmission plays a key role in optimizing performance. The extra gears allow for better fuel efficiency, smoother acceleration, and improved low-speed control, which is crucial for off-roading and towing heavy loads.
The Allison 10-speed automatic on the Duramax diesel is particularly noteworthy. This transmission is designed to handle extreme torque levels while providing precise gear changes, ensuring that power is delivered exactly when you need it—whether you're towing a trailer up a steep incline or crawling over rocks.
Suspension and Off-Road Performance: Built for Extreme Conditions
One of the standout features of the Sierra HD AT4X AEV is its upgraded suspension system, designed to tackle the toughest terrains while maintaining comfort.
Multimatic DSSV Dampers – Advanced Off-Road Technology
- The truck is equipped with Multimatic Dynamic Suspensions Spool Valve (DSSV) dampers, an advanced suspension system that automatically adjusts to terrain conditions.
- These dampers offer exceptional wheel articulation, allowing for smoother handling over rocks, mud, and uneven surfaces.
- DSSV technology, borrowed from high-performance off-road racing, provides a balance between comfort on paved roads and extreme capability off-road.
1.5-Inch Suspension Lift – Higher Ground Clearance
- The factory-installed 1.5-inch lift improves approach and departure angles, making it easier to navigate steep inclines and obstacles.
- The total ground clearance reaches 11.8 inches, giving the truck better breakover angles when crossing large rocks or deep ruts.
35-Inch Goodyear Wrangler Territory MT Tires
- These massive mud-terrain (MT) tires provide excellent traction in mud, sand, snow, and rocky terrain.
- The aggressive tread pattern ensures grip even in the most challenging conditions.
- The 18-inch AEV Salta wheels are specifically designed for durability, ensuring they can withstand harsh impacts and rugged environments.
Towing and Payload Capacity: Heavy-Duty Strength
Despite being an off-road powerhouse, the Sierra HD AT4X AEV remains a true heavy-duty truck with impressive towing capabilities.
- Gas Engine Towing Capacity: Up to 18,000 lbs
- Duramax Diesel Towing Capacity: Up to 22,500 lbs
- Payload Capacity: Around 3,500 lbs (varies by configuration)
This means the Sierra HD AT4X AEV can haul large trailers, campers, boats, and heavy equipment with ease, making it a versatile option for both work and adventure.
On-Road and Off-Road Driving Experience
Whether you're driving on pavement or venturing off the beaten path, the Sierra HD AT4X AEV delivers a well-balanced driving experience.
On-Road Performance
- Despite its size, the truck offers surprisingly smooth highway driving, thanks to DSSV dampers and a refined suspension.
- The steering is precise for a heavy-duty truck, making it easier to maneuver than some of its competitors.
- The 10-speed automatic transmission shifts smoothly, allowing for strong acceleration and highway cruising without excessive engine noise.
Off-Road Performance
The AEV upgrades significantly enhance the truck’s off-road performance:
- Front and rear steel bumpers improve durability and impact resistance.
- Skid plates protect vital components, such as the oil pan, fuel tank, and transfer case.
- AEV’s tuned suspension and extra ground clearance make tackling deep ruts, steep climbs, and rocky trails easier.
- The rear locking differential ensures power is distributed evenly between the rear wheels, preventing slippage in difficult conditions.
Off-Road Capability
Increased Ground Clearance and Suspension Upgrades
- Better approach and departure angles, allowing the truck to climb over obstacles without scraping the undercarriage.
- Improved breakover angle, reducing the risk of getting stuck on uneven terrain.
- Higher ride height, helping to navigate deep ruts, snow, and water crossings.
Multimatic DSSV Dampers: Advanced Off-Road Suspension
How DSSV Dampers Improve Off-Road Performance
- Adaptive Damping: Unlike conventional shocks, DSSV dampers adjust automatically based on terrain, absorbing impacts from rocks, potholes, and jumps.
- Better Articulation: The improved suspension travel allows the wheels to stay planted, even on uneven terrain.
- Smoother Ride: The system provides excellent shock absorption, reducing jarring impacts when driving over rough terrain.
- More Stability: Reduces body roll when cornering on trails, improving handling and comfort.
35-Inch Goodyear Wrangler Territory MT Tires
- Deep tread for maximum grip on loose gravel, mud, and sand.
- Thick sidewalls for added durability, reducing the risk of punctures from sharp rocks.
- Self-cleaning tread design to prevent mud and snow from clogging the tires.
- Optimized for on-road comfort, meaning you don’t sacrifice daily drivability.
Heavy-Duty Skid Plates and Underbody Protection
- Engine and oil pan – Prevents damage from large rocks and debris.
- Transfer case – Essential for off-road power distribution.
- Fuel tank – Keeps fuel lines and tank safe from punctures.
Improved Approach, Departure, and Breakover Angles
- Approach Angle: 29.8° (allows for better clearance when climbing obstacles)
- Departure Angle: 25.7° (prevents the rear bumper from dragging on steep descents)
- Breakover Angle: 21.2° (reduces the risk of getting high-centered on ridges or rocks)
Locking Differentials and Off-Road Drive Modes
- Sends equal power to both rear wheels, ensuring maximum grip on mud, snow, and rocky terrain.
- Essential for rock crawling and getting out of deep ruts.
- Terrain Mode: Adjusts throttle and traction control for crawling over rocks and rough terrain.
- Tow/Haul Mode: Optimized for pulling heavy loads on steep or uneven surfaces.
- Hill Descent Control: Maintains a controlled speed when going downhill, preventing wheel slip.
Water Fording and Deep Mud Capability
- Sealed components protect against water damage.
- Higher-mounted air intake helps prevent engine flooding.
- Mud-Terrain tires with self-cleaning treads improve grip in deep mud and soft surfaces.
Interior Comfort and Technology
Premium Interior Design and Materials
- Obsidian Rush Interior with Full-Grain Leather – The cabin is wrapped in premium leather, featuring a bold Obsidian Rush color scheme that gives it a high-end, adventurous feel.
- AEV Embossed Headrests and Floor Liners – The AEV logo is subtly embossed on the front seats and all-weather floor liners, reinforcing its special-edition status.
- Vanta Ash Wood Trim – The genuine open-pore wood trim adds an elegant contrast to the rugged nature of the truck.
- Heated and Ventilated Front Seats – Both heated and cooled front seats come standard, ensuring comfort in all weather conditions.
- Heated Rear Seats – A rare feature in off-road trucks, heated rear seats provide extra comfort for passengers during cold-weather expeditions.
- Massage Function for Front Seats – The driver and front passenger seats include a built-in massage feature, enhancing long-distance driving comfort.
Cutting-Edge Technology and Infotainment
- 13.4-Inch GMC Premium Infotainment Touchscreen – The centerpiece of the dashboard is a massive touchscreen with a crystal-clear display, fast response times, and an intuitive interface.
- Wireless Apple CarPlay and Android Auto – Seamless smartphone integration allows drivers to access maps, music, calls, and apps without needing cables.
- Bose Premium Sound System – A 12-speaker Bose system delivers immersive, high-quality audio, perfect for long drives and outdoor adventures.
- Built-in Google Assistant and Amazon Alexa – Voice commands allow drivers to control music, navigation, and vehicle settings hands-free.
- Multiple USB-C and Wireless Charging – Convenient charging options ensure all devices stay powered during long trips.
Digital Instrument Cluster and Head-Up Display
- 12.3-Inch Digital Driver Display – Fully customizable, showing speed, navigation, off-road telemetry, towing data, and more.
- 15-Inch Head-Up Display (HUD) – Projects key driving information onto the windshield, reducing distractions while driving.
- Off-Road Data Display – Includes pitch and roll angles, tire pressure monitoring, differential lock status, and altitude readings.
Advanced Off-Road and Driver Assistance Technology
- Off-Road Performance Display – Shows real-time vehicle diagnostics, such as suspension movement, tire pressure, and drivetrain status.
- Front and Rear Electronic Locking Differentials – Improves traction on slippery or uneven surfaces by ensuring power is evenly distributed to the wheels.
- Surround-View Camera System with Off-Road Views – Multiple high-definition cameras provide a 360-degree view of the truck, including underbody views to help navigate tough terrain.
- Hill Descent Control – Automatically manages braking and throttle when descending steep trails.
- Trailer Blind Spot Monitoring – Helps drivers safely change lanes when towing large trailers.
Spacious Cabin and Practical Storage Solutions
Spacious Interior
- Best-in-Class Rear Seat Legroom – Rear passengers get ample space, making long journeys more comfortable.
- Rear Seat Storage Compartments – Hidden compartments behind the rear seats provide extra storage for tools, recovery gear, or valuables.
- Large Center Console – Offers deep storage for electronics, paperwork, and everyday essentials.
- Door Pocket Storage and Cup Holders – Designed for easy access to essentials, such as water bottles and snacks.
Quiet and Comfortable Ride
- Active Noise Cancellation – Uses microphones and sound waves to reduce engine, tire, and wind noise inside the cabin.
- Acoustic-Laminated Glass – Helps keep the interior quieter, even at highway speeds.
- Multimatic DSSV Suspension for a Smoother Ride – Absorbs impacts from potholes and bumps, ensuring less cabin vibration.
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