1-2017-GMC-Sierra-All-Terrain-X-HD-Duramax-10-10-16
Expanding its All Terrain X models, GMC announced today that the Duramax-powered Sierra HD will be offered for 2017. The Sierra HD All Terrain X will join the Canyon and Sierra 1500 this fall as the third model in the All Terrain X series (see our test of the Duramax Canyon in the ’16 Mid-Size Shootout).