GMC Sierra All Terrain HD Concept 2011


A slick new piece of suspension The Sierra All Terrain also has an electronic front stabilizer bar disconnect. The Ram features a front sway bar disconnect system that increases wheel travel and articulation to climb over tall obstacles. The All Terrain HD also borrows a cool trick for its front suspension from the straight axle Power Wagon. We wouldn’t be surprised if this latest Fox development effort causes a major rift with Ford, which brought prominence and high volume production expertise to Fox in OEM off road applications.

While Ram doesn’t offer Fox shocks for the Power Wagon, Chrysler Mopar performance parts division will also feature Fox Shocks as part of its aggressive Ram Runner dealer installed off road package for the light duty Ram 1500. In the Sierra, Fox’s long travel dampers add 2 inches more travel up front (11 inches total) and 3 inches in the rear (11.75 inches total) over the Sierra’s stock monotube shocks. There are no external bypass tubes to be damaged by offroad debris striking them; there are no worries about check valve durability; and the shocks can be tuned specifically to the Sierra All Terrain’s off road character. Hardcore off-roaders might not like this setup, but it solves several potential issues both for GMC and for less obsessive desert running enthusiasts. The valves have been replaced with very small gates, precisely placed for optimal damping in all conditions.

Instead of placing the oil routers outside the shocks, Fox sealed them inside the main tube so that they can’t be adjusted. Fox Racing’s internal bypass technology is slick and maintenance free. Fox’s shocks are the key components that give the Raptor such awesome wheel travel at high speeds off-road. If GMC wanted to get Ford’s attention, this should do it.