Ford F-650 2015 Owner's Manual page 138

To shift the axle from LOW to HIGH with your vehicle stopped, place the
transmission in position N, then press the lower part of the switch.
To shift the axle from LOW to HIGH with your vehicle moving, accelerate
to approximately 35 mph (56 km/h), press the lower part of the switch
while the transmission is in position N, then release and apply the
accelerator.
To shift the axle from HIGH to LOW with the vehicle stopped, place the
transmission in position N, then press the upper part of the switch.
Split-shifting (Combined Axle and Transmission Shift) (Manual
Transmission Only)
To downshift the axle to a slower ratio and shift the transmission, shift
the transmission and move the switch to the lower ratio before the
clutch is re-engaged.
To upshift the axle and shift the transmission, move the switch to a
faster ratio and make the transmission shift in the usual manner.
Ratio combination 1
Transmission gear 1st 1st 2nd 2nd 3rd 3rd 4th 4th 5th 6th 6th
Axle range LO HI
Ratio Extender Use
Low end: You can use a two-speed axle as a ratio-extender when
split-shifting is not necessary. For low end use, just shift the axle into
LOW to start out, and shift to HIGH when you longer need the extra
torque.
Transmission (5-speed)
Two-speed axle
High end: To use the two-speed axle as a high-end ratio-extender, stay
in the LOW range for normal upshifts and only shift the axle to HIGH on
the freeway for greater road speed.
Transmission (5-speed)
Two-speed axle
2015 F-650/750 (f67)
Owners Guide gf (ownloose), 1st Printing, December 2013
Canadian_French (fr_can)
Transmission
Split-shift Sequence
2 3 4 5 6
LO HI LO HI
1st 1st 2nd 3rd 4th 5th 6th
Axle low
1st 2nd 3rd 4th 5th
Low for gradeability
I n f o r ma t i o n P r o v i d e d b y :
137
7 8 9 10 11
LO HI LO LO HI
Axle high
6th
Axle high