FORD 2009 Explorer Sport Trac v.2 - Manual (Page 276)

4. With the spare tire on the ground,
remove the retainer from the spare
tire.
Changing the spare tire
WARNING: 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).
WARNING: To help prevent the vehicle from moving when you
change a tire, be sure the parking brake is set, then block the
wheel that is diagonally opposite (other end of the vehicle) to the tire
being changed.
WARNING: If the vehicle slips off the jack, you or someone else
could be seriously injured.
WARNING: Do not attempt to change a tire on the side of the
vehicle close to moving traffic. Pull far enough off the road to
avoid the danger of being hit when operating the jack or changing the
wheel.
2009 07+ Explorer Sport Trac (esp)
Owners Guide, 2nd Printing
USA (fus)
Roadside Emergencies
276