The new 6.6-liter GM Duramax L5P V-8 turbodiesel is expected under the hood, as well as the Allison 1000 automatic transmission. A gasoline engine is not likely, unlike the V-8 large-block 8, 1 liter offered in Kodiak and TopKick trucks in the 2000s. Chris Baker caught a few shots of this prototype that appears to …
