New 2024 Gmc Sierra Hd. The 2024 gmc sierra hd features two new trims designed to boost the truck’s appeal (and sticker price): These duramax power increases come courtesy of a new more efficient turbocharger, new cylinder heads with improved cooling, new higher pressure fuel injectors, and a new engine management.
Available trims include pro, sle, slt, at4, denali and denali ultimate, with at4x trim. They support the lineup’s highest trailering capacity: