GMC Sierra All Terrain HD Concept
When the GMC Sierra All Terrain HD Concept was first previewed ahead of its debut at next week's Detroit Auto Show, all we got was a meager handful of photos and a 360-degree video. Today GM fixes that with this gallery exposing the truck in more detail, including the interior.
As GMC's "concept only" exploration of the extremes of heavy-duty offroad capability, the All Terrain HD packs a modified production-based chassis housing a Duramax diesel and Allison 1000 six-speed transmission, but that's where the similarities end. Race-grade dampers, long-travel suspension, better departure and approach angles, and a host of other upgrades make this perhaps the ultimate hauler for serious backcountry.
For more details on the All Terrain HD concept, be sure to check out our preview.