Ford Super Duty Owner's Manual page 206

Recommended shift speeds
Upshift according to the following chart:
Upshifts when accelerating (recommended for best fuel
Shift from:
1 – 2
2 – 3
3 – 4
4 – 5
5 – 6
In order to prevent the engine from running at too low an RPM, which may
cause it to stall, SelectShift will still automatically make some downshifts
if it has determined that you have not downshifted in time. Although
SelectShift will make some downshifts for you, it will still allow you to
downshift at any time as long as the SelectShift determines that the
engine will not be damaged from over-revving.
SelectShift will not automatically upshift, even if the engine is
approaching the RPM limit. It must be shifted manually by pressing
the + button.
Engine damage may occur if excessive engine revving is held
without shifting.
Automatic Transmission Adaptive Learning
This feature is designed to increase durability and provide consistent
shift feel over the life of the vehicle. A new vehicle or transmission may
have firm shifts, soft shifts or both. This operation is considered normal
and will not affect function or durability of the transmission. Over time,
the adaptive learning process will fully update transmission operation.
Additionally, whenever the battery is disconnected or a new battery
installed, the strategy must be relearned.
2013 F-250/350/450/550 (f23)
Owners Guide gf, 3rd Printing, December 2012
USA (fus)
Transmission
economy)
Gasoline engines
15 mph (24 km/h)
25 mph (40 km/h)
40 mph (64 km/h)
45 mph (72 km/h)
50 mph (80 km/h)
205
Diesel engines
12 mph (19 km/h)
19 mph (31 km/h)
26 mph (42 km/h)
34 mph (55 km/h)
46 mph (74 km/h)