GMC has unveiled the Sierra All Terrain HD Concept which is mentioned as the exploration of heavy-duty truck capability combined with greater off-road versatility, highlighted by a bold exterior design.
The new 2011 Sierra HD also underpins the All Terrain HD concept, with a modified, production-based 4WD chassis and the Duramax diesel/Allison 1000 six-speed powertrain. Read more [ via : lephie ]
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