GMC LIFE

With GMC trucks, innovation never stops, and the Sierra Heavy Duty is no exception. GMC is continuing to break new ground with the 2024 model year, bringing turbocharged power to the iconic pickup truck. 

GMC Sierra Heavy Duty trucks are built for towing*, and with more power comes more capability. 

GMC is committed to elevating the experience for drivers so you can do more. Through professional-grade engineering, GMC was able to achieve several enhancements under the hood, resulting in improved towing capabilities.

The new 2024 Sierra Heavy Duty truck builds upon a supreme foundation, taking the already capable 6.6L Duramax® Turbo-Diesel V8 engine to new heights. The available 6.6L Duramax Turbo-Diesel paired with an all-new turbocharger and a 10-speed Allison® transmission now offers 470 HP (at 2,800 rpm).

The Sierra HD also offers 975 lb-ft (at 1,600 rpm) of torque, up to a 25% increase in low-end torque over the previous model year, delivering more power across the entire operating speed range, specifically at low speeds.

The available 10-speed Allison® transmission also enhances trailering capability when paired with the Sierra HD's standard gas engine. It replaces the previous 6-speed automatic engine, which needs to take smaller “steps” between gears, allowing the 6.6L gas engine to reach peak power for longer periods of time.

This translates to a more confident feeling of on-demand power, regardless of whether the truck is towing a trailer — but when you are towing, the trailering capabilities are enhanced. Thanks in part to the 10-speed configuration and the capability of channeling every single pound-foot of torque to the tires in every gear.

The enhancements don’t stop there — additional changes and upgrades were designed to produce more efficient combustion to improve the overall performance. The latest edition of the Duramax engine offers additional improvements including:

• An all-new, more efficient turbocharger with improved efficiency to boost low-end torque
• Increased power and torque over the entire operating speed range
• Improved engine braking with a more powerful turbo vane actuator and uprated valve springs
• New cylinder heads with improved cooling jackets
• An all-new combustion system within the heads that are matched with next-generation, higher-flow injectors and greater fuel injection pressure
• All-new engine controller
• Robustness improvements to the cylinder head and glow plugs
  

Sierra HDs are built for towing. Whether you’re towing a camper for a weekend getaway, a boat for a day at the lake or equipment for a DIY project, the Sierra HD pickup truck is the perfect companion to pull your world.

The extensive refinements under the hood bring improved trailering capabilities for the 2024 Sierra Heavy Duty, offering a best-in-class 2500 Crew Cab max towing capacity of 22,070 lbs.*, a maximum gooseneck/fifth-wheel rating of up to 22,430 lbs.*, and a maximum payload of up to 4,178 lbs.*.

For those who need the power of a 3500 Heavy Duty truck, the 2024 Sierra 3500 Heavy Duty boasts an impressive maximum gooseneck/fifth-wheel available rating of up to 36,000 lbs.* and a maximum payload of up to 7,290 lbs.*.