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gmc sierra hd concept

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    Report: GMC Sierra HD concept coming to Detroit

    2011 GMC Sierra HD – Click above for high-res image gallery
    General Motors' heavy-duty truck twins – the GMC Sierra HD and Chevrolet Silverado HD – were reworked for 2011 with the addition of an all-new chassis and an upgraded 6.6-liter Duramax diesel engine. But while the ...


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