For those of you with the 4Wheel Load Leveling Suspension (4WLLS) you might want to avoid driving with the suspension system turned off by the service switch. The reason is that turning the system off also turns off the Variable Orfice feature. That means your getting full power steering assist at highway speeds... not what Ford intended for good feel. I know its cool to get an extra 1 inch lift, but this is not a good way to do it.

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'01 EB Expy 4x4, 5.4L, 3.55LS w/tow pkg, 4 Wheel Air Suspension, Moonroof