I've got a 2000 expedition 5.4 w/4R100.
mode switch on the dash is A4WD/4x4HI/4x4LO
And no vacuum actuater on the front diff, just vent tube.
tires are all within 1/4 of each other, all at same air pressure.
mode switch is good, lights all work in the dash when respective
4x modes are...
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