Those who stick with the GMC's standard gas-fed V-8 should expect to see even worse fuel economy than with the diesel option. Inside, the Sierra 2500HD and 3500HD have a huge dashboard that hosts ...
Coinciding with the release of GMC's heavy-duty version of their one-ton truck in 2007 (the GMC 3500HD), the GMC Sierra 3500 Classic was a carry-over of the 2006 Sierra 3500. Available in regular cab, ...
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