Ford Mustang 2013 Owner's Manual page 170

170
For the 5.0L V8, shift according to the following chart:
Upshifts when accelerating
(recommended for best fuel economy)
1 - 2
2 - 3
3 - 4
4 - 5
5 - 6
Reverse
Note: The gearshift lever can only be moved to R (Reverse) by pushing
the knob down before shifting to reverse. This is a lockout feature which
protects the transmission from accidentally engaging R (Reverse) when
intending to select 1 (First).
1. Make sure that your vehicle is at a complete stop before you shift into
R (Reverse). Failure to do so may damage the transmission.
2. Press the clutch pedal to the floor to disengage clutch.
Note: Do not press down on the shifter during any operation other than
shifting to R (Reverse), as you may be inhibited from selecting your
desired gear.
If R (Reverse) is not fully engaged, press the clutch pedal down and
return the gearshift to the neutral position. Release the clutch pedal for a
moment, then press it down and shift to R (Reverse) again.
2013 05+ Mustang (197)
Owners Guide gf, 1st Printing
USA (fus)
Transmission
Shift from:
17 mph (27 km/h)
25 mph (40 km/h)
40 mph (64 km/h)
45 mph (72 km/h)
50 mph (80 km/h)
3. Shift into R (Reverse) by pushing
the gearshift knob down, then
moving the lever fully to the left,
then forward.