GMC is introducing the Sierra HD AT4X with the intent that there is no heavy-duty task too challenging or overlanding setup too big.
Introduced on the heels of the Silverado HD ZR2, the Sierra HD AT4X carries an identical complement of upgrades, tricks, and capabilities. What are they exactly? Let’s take a look!
Interested in connecting with other Sierra HD owners and enthusiasts?
— Visit the GM-Trucks.com Forum
— Join our Silverado HD ZR2 / Sierra HD AT4X Community on Facebook
If the Chevrolet Silverado is more your style- the Silverado HD ZR2 is worth a look!
What is the Sierra HD AT4X?
- Standard 6.6L Gasoline Engine
- Available 18,500 lb towing capacity
- Factory 1.5-inch lift
- Multimatic DSSV Dampers / Shocks
- 35-inch Goodyear Territory Tires
- E-Locking Rear Differential
- Specific upper and lower control arms to fit the factory lift
- Steel transfer case skip plate
- Aluminum front skid-plate
- Unique “Obsidian Rush” interior color scheme with premium features like massaging front seats and full-grain leather seating
- Standard “Off-Road Mode” which calibrates the anti-lock brakes, stability control, and traction control to keep the vehicle planted off-road.
- Included 14-camera-view off-road vision system with transparent trailer
- 13.4-inch diagonal infotainment screen with 12.3-inch digital gauge cluster
- 15-inch heads up display
- 12 speaker Bose Premium series audio system with Centerpoint
- Optional 6.6L Duramax Diesel Engine w/470 horsepower and 975 lb-ft of torque
- Both engines mated with 10-speed Allison automatic transmission
Sierra HD AT4X AEV Edition
If all of those features were not enough to satisfy- the Sierra HD AT4X AEV Edition is here to quench your overlanding thirst.
The AEV Edition builds upon the HD AT4X with additional features. Those include stamped steel bumpers with winch and recovery provisions. An even more robust skid-plate system that additionally protects the steering system and transfer case. There’s also AEV-specific 18-inch Salta wheels for extra durability off-road.
“The Sierra HD is an ideal foundation when it comes to on-road performance, off-road capability and insane pulling power,” said AEV CEO and founder Dave Harriton. “As with the Sierra 1500 before it, we took AEV’s signature performance-driven approach and dedication to detail to elevate the aspects that off-road customers want and demand in their heavy-duty truck. The result is an awesome truck with capability and confidence in all the right spots.”
Why is GMC building an HD Overlanding Rig?
As overlanding has increased in popularity, more extensive and significant setups have permeated the community. You’ve probably noticed that slide-in-bed campers can get quite large. An HD truck with off-road capability is a perfect starting point for someone who wants to bring their truck off the beaten path for weeks at a time and allows customers to load up even more of their stuff for the trip.
2024 GMC SIERRA AT4X & AT4X AEV EDITION SPECIFICATIONS
CONFIGURATION
| 2500HD | Crew Cab Standard Bed (4WD) |
ENGINES
| Type: | 6.6L V-8 gasoline or E85 FlexFuel |
| Bore & Stroke (in. / mm): | 4.06 x 3.86 / 103.25 x 98 |
| Block Material: | Cast iron with nodular iron main caps |
| Cylinder Head Material: | Cast aluminum |
| Compression Ratio: | 10.8:1 |
| Valvetrain: | Overhead-valve, two valves per cylinder, variable valve timing |
| Fuel Delivery: | Direct fuel injection |
| Horsepower (hp / kW @ rpm): | 401 / 299 @ 5200 (SAE certified – gasoline) |
| Torque (lb.-ft. / Nm @ rpm): | 464 / 629 @ 4000 (SAE certified – gasoline) |
| Type: | Duramax 6.6L V-8 Turbo-Diesel |
| Bore & Stroke (in. / mm): | 4.05 x 3.89 / 103 x 99 |
| Block Material: | Cast iron |
| Cylinder Head Material: | Cast aluminum |
| Compression Ratio: | 16.0:1 |
| Valvetrain: | Overhead-valve, four valves per cylinder |
| Fuel Delivery: | Common-rail direct fuel injection |
| Horsepower (hp / kW @ rpm): | 470 / 350 @ 2800 (per SAE J1349) |
| Torque (lb.-ft. / Nm @ rpm): | 975 / 1322 @ 1600 (per SAE J1349) |
TRANSMISSION & AXLE
| Type: | Allison® 10L1000 10-speed automatic |
| Gear Ratios (:1): | |
| First | 4.54 |
| Second | 2.87 |
| Third | 2.06 |
| Fourth | 1.72 |
| Fifth | 1.48 |
| Sixth | 1.26 |
| Seventh | 1.00 |
| Eighth | 0.85 |
| Ninth | 0.69 |
| Tenth | 0.63 |
| Reverse | 4.54 |
| Final Drive Ratio: | 3.73 (6.6L gas) 3.42 (6.6L diesel) |
CHASSIS & SUSPENSION
| Front Suspension: | Independent front suspension with torsion bars |
| Rear Suspension: | Semi-elliptic, two-stage, multi-lead springs |
| Steering Type: | Hydraulic power-assisted recirculating ball |
| Brake Type: | Hydraulic power-assisted Hydroboost brake booster, four-wheel disc brakes with ABS and Stabilitrak electronic stability assist |
| Brake Rotor Size (in. / mm): | Front: 14 x 1.6 / 355 x 40 Rear: 14.1 x 1.3 / 360 x 34 |
| Wheel Size: | 18 x 9-in. aluminum |
| Tire Size: | LT305/70R18 MT |
FUEL TANK CAPACITY (approx.)
| Fuel Tank (gal. / L): | 36 / 136 (gas and diesel) |
EXTERIOR DIMENSIONS
| Wheelbase (in. / mm): | 159.1 / 4042 |
| Overall Length (in. / mm): | 250.7 / 6369 (AT4X) 252 / 6401 (AT4X AEV Edition) |
| Overall Width (in. / mm): | 81.9 / 2079 (without mirrors) 105.1 / 2670 (with mirrors extended) |
| Overall Height (in. / mm): | 82.6 / 2100 |
| Front Track (in. / mm): | 69.3 / 1762 |
| Rear Track (in. / mm): | 70.0 / 1760 |
| Ground Clearance (in. / mm): | 11.6 / 295 (AT4X) 11.7 / 299 (AT4X AEV Edition) |
| Approach Angle (deg.): | 31.6 (AT4X) 29.8 (AT4X AEV Edition) |
| Departure Angle (deg.): | 25.7 (AT4X & AT4X AEV Edition) |
| Breakover Angle (deg.): | 21.2 (AT4X) 22.6 (AT4X AEV Edition) |
INTERIOR DIMENSIONS
| Headroom (in. / mm): | 43.03 / 1093 (front) 40.12 / 1019 (rear) |
| Legroom (in. / mm): | 44.53 / 1131 (front) 43.4 / 1102 (rear) |
| Shoulder Room (in. / mm): | 66.02 / 1677 (front) 65.3 / 1659 (rear) |
| Hip Room (in. / mm): | 61.18 / 1554 (front) 60.24 / 1530 (rear) |
CURB WEIGHT, GVWR & PAYLOAD1
| Base Curb Weight (lb. / kg): | 7516 / 3409 – AT4X gas 8237 / 3736 – AT4X diesel 7894 / 3581 – AT4X AEV Edition gas 8605 / 3903 – AT4X AEV Edition diesel |
| GVWR (lb. / kg): | 10850 / 4921 – AT4X gas 11350 / 5148 – AT4X diesel 10850 / 4921 – AT4X AEV Edition gas 11350 / 5148 – AT4X AEV Edition diesel |
| Payload1 (lb. / kg): | 3291 / 1493 – AT4X gas 3068 / 1392 – AT4X diesel 2912 / 1321 – AT4X AEV Edition gas 2701 / 1225 – AT4X AEV Edition diesel |
1For comparison purposes only. See the owner’s manual and the label on the vehicle door jamb for the carrying capacity of a specific vehicle.
MAX TRAILERING1
| Conventional (lb. / kg): | 16000 / 7257 – AT4X gas 18500 / 8391 – AT4X diesel 16000 / 7257 – AT4X AEV Edition gas 18400 / 8346 – AT4X AEV Edition diesel |
| Fifth-Wheel/Gooseneck (lb. / kg): |
18000 / 8165 – AT4X gas 17300 / 7847 – AT4X diesel 16200 / 7348 – AT4X AEV Edition gas 14800 / 6713 – AT4X AEV Edition diesel |
1Before you buy a vehicle or use it for trailering, carefully review the Trailering section of the Owner’s Manual.
NOTE: All towing capabilities measured using SAE J2807 metrics.