Sorry, just noticed this thread again...somehow my subsrciption to it disappeared. What the switch does is control the vacuum disconnect in the right front axleshaft. Your right front axleshaft is actually a 2 piece assembly that has a vacuum actuated lock that hooks the two shafts together when you select AUTO or 4WD. What my mod does is give you control over that lock. What that means is you can have a front locker installed, and still have the front wheels operate independently. If you really want to do it cheaply, you could lincoln lock the front end, and then use the switch modification to effectively create a selectable locker type setup. The downside to this is that the left front wheel would always turn with the front driveshaft.
Hope that explains it a little better...if not, pm me and I'll try to answer any questions on it.
so if i put this locker in, one of my front tires is always gonna be driving? is that what you mean? and then when i use the switch, it will lock them both up?