Heavy-duty trucks used to feel like leftover thoughts. These trucks have always had massive powertrains to deliver incredible towing and payload numbers, but only recently have they come into their own. The 2024 GMC Sierra HD AT4 sits right in the middle of the lineup for the next generation of this GMC truck, giving you off-road capabilities at the heavy-duty level.

Is the 2024 GMC Sierra HD lineup as robust as the half-ton model?

Yes, this is how these big haulers have evolved. When this new version of the Sierra HD arrives, the trims offered will be Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate. Does this list look familiar? It should; these are the same trim names that we find for the smaller half-ton Sierra 1500.

What should we see when this new heavy-duty truck arrives?

When the new 2024 GMC Sierra HD AT4 hits the market, it’s expected to offer a healthy dose of off-road ability, luxury appointments, and heavy-duty truck performance. GM Authority tells us the AT4X will arrive later in the model year, which means we’ll have the AT4 as the only off-road-focused version of this truck for a short time. This pickup features:

• New LED projector headlights
• Redesigned AT4-specific front grille and fascia
• Red recovery tow hooks
• Spray-on bedliner
• GMC MultiPro Tailgate
• 20-inch gloss-black aluminum wheels
• BFGoodrich off-road tires
• Off-road suspension package
• Heavy-duty shocks
• Skid plates
• 13.4-inch touchscreen
• 12.3-inch digital instrument display
• Multicolor 15-inch Head-Up Display (optional)
• 10-way power and heated/ventilated leather-covered front seats
• Pro Safety Package
  • Forward collision alert
  • Lane departure warning
  • Emergency automatic braking
  • Front pedestrian braking
  • IntelliBeam automatic high beams
  • Following distance indicator
  • Trailer side blind zone alert (optional)
  • Rear cross-traffic braking (optional)

How much power does the 2024 GMC Sierra HD AT4 produce?

The standard powertrain for this heavy-duty off-road truck is the same naturally aspirated 6.6-liter V8 engine mated to a 10-speed Allison automatic transmission. This powertrain produces 401 horsepower and 464 lb-ft of torque. The only change to this powertrain is the improved transmission with more gears than the outgoing six-speed model.

Of course, if you want more power, you can have this big GMC truck with the 6.6-liter turbodiesel Duramax V8 engine. This engine is tuned up to provide 470 horsepower and 975 lb-ft of torque compared to the 445 horsepower and 910 lb-ft of torque from the previous generation. This diesel also enjoys the benefits of a 10-speed Allison automatic transmission.

That’s not all, but more details about this big off-road truck will have to wait

Currently, we don’t have pricing information, off-road angles, ground clearance numbers, or the release date of this truck. Stay tuned for more information as we get closer to the 2024 model year. The new 2024 GMC Sierra HD AT4 is scheduled to enter production during the first quarter of 2023. This signals that this big tuck might be an early model-year release.

Next, check out some fuel-efficient off-road trucks, or watch the current GMC Sierra HD in this video below: