The 2024 GMC Sierra 1500 Light-Duty Pickup Truck offers a 2.7L Turbo High-Output Engine, up to 13000 lbs. of best-in-class 4WD diesel towing, and more. Without changing the formula much, GMC has made one significant revision to the 2024 Sierra 1500 lineup by making the 305-hp turbocharged 3.0-liter inline-six Duramax diesel the standard powertrain for the AT4X off-road pickup. There are also two new wheel options, new colors such as Downpour metallic and Thunderstorm Gray, and a new nickname for the 310-hp turbocharged 2.7-liter inline-four engine: call it TurboMax from now on.