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A trademark application filed by General Motors for the name Z71 Trail Boss suggests a more hardcore off-roader could be in store for Chevy or GMC in the near future.

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General Motors has finally dropped the curtain on the 2014 Chevrolet Silverado and 2014 GMC Sierra. Both trucks have undergone substantial revisions with updated versions of the company's 4.3-liter V6, 5.3-liter V8 and 6.2-liter V8 engines. In a shot across the bows of both Ford and Chrysler, GM says it won't use a V6 engine adapted from passenger car applications. Instead, it developed the 4.3-liter engine based on its proven truck-duty architecture.

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Without so much as an accompanying press release, General Motors released a slew of new images yesterday that show us what the Z71 off-road package looks like on two of the three GMT900 model SUVs. The Avalanche, Tahoe and Suburban are available with a Z71 package that adds, of course, the Z71 off-road suspension, new 18-inch aluminum wheels mounted on combination on-/off-road tires, an automatic locking rear diff, and high-pressure shocks. That's it for the hardcore mechanicals, though buyers w

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Some resourceful members of the GMInsideNews community managed to grab what appears to be official pics somewhere of a Chevy Suburban wearing the not-yet-released Z71 offroad package. Rather than being purely cosmetic, the Z71 package will add a host of real mechanical upgrades to the Suburban, Silverado and Avalanche. Of course, Chevy is still making sure its big SUV and trucks look the part of the rugged off-roader.

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