A SERVICE OF

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When one of the rear wheels is off the ground, the transmission
alone will not prevent the vehicle from moving or slipping off the
jack, even if the transmission is in P (Park). To prevent the vehicle
from moving when you change the tire, be sure that the parking brake
is set and block the wheels (both front or both rear) on the opposite
end of the vehicle from the wheel being changed. If on a grade, block
both opposite wheels on the downward side of the hill. If the vehicle
slips off the jack, someone could be seriously injured.
Front
Rear
2007 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)
Roadside Emergencies
302