The 2024 GMC Sierra HD will arrive at dealerships in early 2023 with a few changes in store. All trim variants get updated styling cues with reshaped front bumpers, new grille designs, and bespoke materials. The lineup will also include the first-ever Sierra HD Denali Ultimate, which has enough luxury features to make it the most premium and tech-filled Sierra yet. The General is also lining up the Sierra HD AT4X for release later in 2023 as the most off-road capable Sierra HD yet.

?The new and enhanced 2024 Sierra HD builds on an already winning foundation,? said Duncan Aldred, Vice President of Global Buick and GMC. ?The truck elevates the HD segment with the introductions of the Denali Ultimate trim and will soon add the seriously capable AT4X trim, further strengthening the dominance of the GMC truck portfolio.?
2024 GMC Sierra HD: What?s New"

Apart from the cosmetic updates, more changes are in store for the 2024 GMC Sierra HD, namely a few mechanical upgrades first seen in the 2024 Chevy Silverado HD. The standard 6.6-liter gasoline-fed V8 now has a 10-speed Allison automatic transmission that GMC said has smaller ?steps? between gear changes, allowing for more efficient use of the truck’s 401 horsepower and 464 lb-ft. of torque.

Meanwhile, the optional 6.6-liter Duramax turbo-diesel V8 also gets the 10-speed Allison automatic gearbox to pair with its higher output. The diesel mill now has 470 horsepower and 975 lb-ft. of torque, with most of ...