Ford F-650 Owner's Manual page 144

Driving
TWO-SPEED REAR AXLE (IF EQUIPPED)
A two-speed rear axle allows the
driver to select a LO range for
greater pulling power and a HI
range for greater road speed and
fuel economy. These ranges can also
be used to provide additional steps
between transmission shifts when
driving on steep grades and/or fuel
economy may be factors.
Note: Do not shift between ranges
when the speed control is on.
WARNING: Never shift a two-speed axle when descending a
steep grade as this may cause loss of vehicle control and result
in personal injury.
Axle shifting
Manual transmissions
• To downshift, select the next lower gear, release and press the
accelerator pedal rapidly, or while holding the accelerator pedal down,
release and engage the clutch rapidly. Note: The clutch method is
recommended when driving at slower speeds.
• To upshift, keep the accelerator pedal down, select the next higher
gear, release the accelerator and pause until the axle upshifts. Note:
De-clutch for smoother axle upshifts when driving at slower speeds.
Automatic transmissions
• Use LOW when you drive a fully-loaded vehicle on a severe grade or
in congested traffic. To activate LOW, press the upper portion of the
switch.
• Use HIGH for all normal driving conditions with a lightly-loaded or
partially-loaded vehicle. To activate HIGH, press the lower portion of
the switch.
Note: You can't split-shift with an automatic transmission. Also,
downshifting above 40 mph (64 km/h) may result in transmission or axle
damage.
To shift the axle from LOW to HIGH with the vehicle stopped, place the
transmission in N (Neutral), then press the lower part of the switch.
144
2012 F-650/750 (f67)
Supplement, 2nd Printing
USA (fus)
2SPD
LOW
HIGH