Full 2013 GMC Sierra 2500HD Review
What's New for 2013
For 2013, the GMC Sierra 2500HD gains a new bi-fuel-compatible 6.0-liter V8. This engine option allows owners to run either compressed natural gas (CNG) or gasoline.
Introduction
Although GMC is known as the truck division of General Motors, it's no big secret that its vehicles are under-the-skin-twins to various Chevrolets. As such, the 2013 GMC Sierra 2500HD shares its Silverado relative's strengths and weaknesses. There's much more of the former than the latter, making the Sierra 2500HD a serious slugger in a game of heavy hitters.
A 2013 Sierra may not look much different from a 2007 (when it was last fully redesigned) but there have been plenty of steady improvements -- including a stouter frame, a more powerful turbodiesel engine, a new Allison transmission and a revised suspension ? made since then. Altogether, these upgrades contribute to the current Sierra's comfortable ride, strong performance, confident handling and substantial hauling/towing capacities. How substantial? How about a maximum towing capacity approaching 18,000 pounds?
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