A new photo of the 2011 GMC Sierra 3500 Heavy Duty has been released on the internet this week, showcasing a new hood with louvers, 6'6 liter Duramax emblems hinting at a new motor, and emblems for Duramax's new 6 speed Allison transmission' You can expect the Chevrolet Silverado HD to receive the same features and upgrades' [ PUT ]

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