Ford F series Owner's Manual page 71

If your vehicle's gearshift lever is mounted
on the floor:
1. Put the gearshift in 1 (First).
2. Turn the ignition key to OFF.
3. Set the parking brake fully before removing
your foot from the service brake.
4. Push and hold in the key release button.
5. Turn the key to LOCK.
6. Remove the key.
Always set the parking brake fully and
make sure that the gearshift is latched in
P (Park) (automatic transmission) or 1
(First) (manual transmission).
With the transfer case in N (Neutral), the vehicle
is free to move with either the automatic
transmission in P (Park) or with the manual
transmission in any driving gear.
Do not leave the vehicle unattended with
the transfer case in the N (Neutral)
position. Always set the parking brake
fully and turn off the ignition when
leaving the vehicle.
Do not leave children, unreliable adults,
or pets unattended in your vehicle.
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