Ford F-150 2010 Owner's Manual page 292

Driving
WARNING: Always set the parking brake fully and make sure
the gearshift is latched in P (Park). Turn the ignition to the off
position and remove the key whenever you leave your vehicle.
R (Reverse)
With the gearshift lever in R (Reverse), the vehicle will move backward.
Always come to a complete stop before shifting into and out of R
(Reverse).
N (Neutral)
With the gearshift lever in N (Neutral), the vehicle can be started and is
free to roll. Hold the brake pedal down while in this position.
D (Overdrive)
The normal driving position for the best fuel economy. Transmission
operates in gears one through four.
Overdrive can be deactivated by
pressing the transmission control
switch on the end of the gearshift
lever.
The transmission control indicator
(TCIL) will illuminate on the
instrument cluster.
Drive (not shown)
Drive is activated when the transmission control switch is pressed.
• This position allows for all forward gears except overdrive.
• O/D OFF lamp is illuminated.
• Provides engine braking.
• Use when driving conditions cause excessive shifting from O/D to
other gears. Examples: heavy city traffic where continuous shifting in
and out of overdrive occurs, hilly terrain, heavy loads, trailer towing
and when engine braking is required.
• To return to O/D (Overdrive), press the transmission control switch.
The O/D OFF lamp will not be illuminated.
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O/D
OFF