Could GMC add a halo off-road truck to its full-size pickup lineup? The diesel-powered GMC Sierra All Terrain Heavy Duty Concept — which will debut next month at the 2011 Detroit auto show — points to ...

The 2017 GMC Sierra 2500 HD All Terrain X looks like something a commanding officer of Blackwater would drive. Equal parts imposing and tactical. Equal parts prepared and capable. It doesn’t have to ...

GMC is getting its heavy-duty trucks ready for the mud this summer with its All Terrain package for the Sierra 2500HD and 3500HD. Meant to blend style, tech and ruggedness, the pack includes a lot of ...

GMC introduced the 2015 Sierra All Terrain HD on Thursday with limited changes ahead of an expected on-sale date sometime this summer. A 6.0-liter V8 will continue to be the standard engine making 360 ...

Mark McNabb was a contributor at TopSpeed from 2013 to 2018. Growing up, Mark always had a mind for tinkering on random items throughout his home and dad’s garage, including a 1953 Ford Mainline and ...

In an attempt to further expand and harmonize the GMC brand, the 2015 Sierra Heavy Duty will now get the All Terrain HD trim package option that the Sierra 1500 has offered for several years. All ...

Four-wheel-drive 2500HD and 3500HD with SLE or SLT trim levels can get additional aluminum underbody shields and 18-in., chromed cast-aluminum wheels GMC’s 2015 Sierra All Terrain HD is an ...

Mark McNabb was a contributor at TopSpeed from 2013 to 2018. Growing up, Mark always had a mind for tinkering on random items throughout his home and dad’s garage, including a 1953 Ford Mainline and ...

GMC is adding its All Terrain X package to its HD lineup of trucks. And as far as these types of packages go, it’s one of our favorites. We just reviewed the Sierra 1500 with this option, and it made ...

Blending exclusive design features and off-road prowess, the 2015 GMC Sierra All Terrain HD joins the American manufacturer's range of versatile pickup trucks. The highly capable model will go on sale ...

GMC Sierra HD All Terrain models were off-road-oriented variants that preceded the Sierra HD AT4 pickup truck. To clarify, the All Terrain moniker applied to a package available on the Sierra HD, ...