OK, I still don't have all the details of how exactly the 4x4system works, but I do understand that it's vacuum actuated, right? Now, once it's engaged, if I lose vacuum, does the 4x4 then disengage or does it remain engaged until vacuum disengages it? I'm just curious, but if I happened to be on a sharp incline and it stalled for some reason, it could make a difference in the way the vehicle reacts. Just wondering.....

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98 Explorer (Lemon Law Case in Progress)
Deposit on '00 F-150, X-cab, 4x4, Lariat, Off-road, Trailer Tow, Sunroof, currently missing the fuel filler door, but they're working on that..