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A close-up of the chrome Duramax badge on the hood of the 2015 GMC Sierra Denali 2500HD, paired with the Allison Transmission logo, announces the truck's 6.6-liter Duramax turbodiesel engine mated to the class-leading Allison 1000 six-speed automatic. The polished lettering stands out against the Onyx Black paint.
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