2024 Duramax Denali. The sierra 2500hd denali ultimate looks to elevate the brand’s premium status, with a refreshed duramax, a new exterior, and more. — work truck or show truck?
— we also learn about the l5p duramax engine utilizing improved engine braking through a more potent turbo vane actuator, upgraded valve springs, and the. — looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg.