2024 At4 2024 Duramax Forum. This 2500 hd comes in onyx black on black with kalahari stitching perforated leather interior. (limited specs available, the 2024 gmc sierra 2500hd denali and at4 trims include 4wd, but it's optional on all other trim levels, which.
A forum community dedicated to chevy and gmc duramax diesel owners and enthusiasts. Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg.
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