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Rearview camera available on extended and crew cabs
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OnStar gets Turn-by-Turn Navigation
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XM Satellite Radio now with NavTraffic
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Allison six-speed transmission
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660 pounds-feet of Duramax torque
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Nice tow mirrors
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4x4 models have independent front suspension
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Integrated brake controller
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Dually fenders are steel, not fiberglass or composite
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No second-row captain's chairs available in crew cab
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No side-impact or side curtain airbags
Vehicle Summary
While mechanically identical to the Chevrolet Silverado heavy-duty models, GMC positions the Sierra 2500HD/3500HD to appeal to a more upscale customer. There's a little more flash on the outside and a little more elegance on the inside. But the real selling point for the Sierra is the same as the Silverado: the combination of a Duramax diesel and Allison six-speed automatic transmission. Read more
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