What'S New In The 2024 Gmc Sierra Hd. The sierra hd denali ultimate and the sierra hd at4x. Research the 2024 gmc sierra 2500hd with our expert reviews and ratings.
What’s new for the 2024 gmc sierra hd? Adaptive cruise control with trailering assist, previously standard on the 2024 at4x and denali ultimate trim levels, now comes on the at4 and denali trims as well.