2024 At4 2024 Duramax Engine. — received my 2024 2500 at4 about a month ago after waiting 10 weeks or so. This 2500 hd comes in onyx.
— the 2024 gmc sierra at4x will receive the new 3.0l i6 lz0 turbodiesel duramax as its standard engine, with the current 6.2l v8 l87 gasoline engine as optional. The 2024 gmc yukon at4 refresh will introduce several changes.