Ford Mustang Owner's Manual page 163

The positions of the console-mounted gearshift
Once the gearshift is secure in the desired
position, release the brake pedal and use the
accelerator as necessary.
R (Reverse)
With the gearshift in the R (Reverse) position,
the vehicle will move backward. You should
always come to a complete stop before shifting
into or out of R (Reverse).
N (Neutral)
As in P (Park), there is no power transferred
through the transmission. However, the final
drive is not locked so the wheels are free to
rotate. The vehicle may be started in the N
position, but the ignition key cannot be
removed.
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