After Ford launched their much fellated Raptor, the "other guys" haven't really put forward anything to compete, until now. The GMC Sierra All-Terrain HD could change that, if it goes into production. Powered by a 6.6-liter Duramax turbo-diesel with 397 hp and an earth-shattering 765 lb-ft of torque this truck means serious business. Let's just hope GMC has the fortitude to get 'er up and running.
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