There is a pneumatic device called an "actuator" attached to the front differential that effectively slides the driver side shaft out of the differential. On trucks that have ADD Toyota uses "live hubs" (see hubs section below). This means that both front half shafts and the front diff spin even in 2WD (but not the front drive shaft). There are a set of air bags inside the actuator that control the position of the ADD sleeve. This actuator will stay in it's current position until vacuum is applied to change it's position even if there is no vacuum at all. For 2WD operation vacuum is applied to driver side tube of the actuator and it holds the sleeve in the out position.
For the second year in a row, the Inland Empire Four Wheelers hosted their Big Bear Forest Fest in the San Bernadino Mountains, just east of Los Angeles. This area of Southern California is known for it's wide array of recreational opportunities and the 4 Wheeler is not forsaken in that respect. There are numerous trails for all types of drivers and vehicles.
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Axxxtion Sports..... Axxxtion Sports is heating things up with their 2010 Winter Heat snowmobile calendar! Simply Sexy!