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Onyx Black 2016 GMC Sierra 2500HD SLT Allison 1000 6-Speed Automatic, 4WD, Black Leather. 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 Turbodiesel Awards: * 2016 KBB.com Brand Image Awards Reviews: * Impressive hauling and towing capabilities; refined and quiet ride; strong diesel engine; available CNG fueling for regular V8; solid build quality. Source: Edmunds
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