Split-Shifting (Combined Axle And Transmission Shift-Manual Transmissions Only); Ratio Extender Use; Maximum Vehicle Loading - Ford F650 Owner's Manual

Driving
Note: Do not shift the axle to LO range with the vehicle in motion.
Split-shifting (combined axle and transmission shift - manual
transmissions only)
Ratio
combination
Transmission
gear
Axle range
To downshift the axle to a slower ratio and shift the transmission, shift
the transmission and move the control switch to the lower ratio before
the clutch is re-engaged.
To upshift the axle and shift the transmission, move the control switch
to a faster ratio and make the transmission shift in the usual manner.

Ratio extender use

Low End
A two-speed axle can be used as a ratio-extender when split shifting is
not necessary. For low end use, just shift the axle into the LO to start
out, and shift to HI when the extra torque is no longer needed.
Transmission
(5-speed)
Two-speed Axle
High End
To use the two-speed axle as a high end ratio-extender, stay in the LO
range for normal upshifts and only shift the axle to HI on the freeway for
greater road speed.
Transmission (5-speed)
Two-Speed Axle

MAXIMUM VEHICLE LOADING

Every vehicle manufactured by Ford Motor Company is supplied with
information on the Vehicle Rating Decal listing the maximum loading for
the vehicle (GVWR), and its axle systems (GAWR) at the tire to ground
interface.
136
Split-shift sequence
1 2 3
1st 1st 2nd 2nd 3rd 3rd 4th 4th 5th 6th 6th
LO HI LO
1st
Axle
Low
4 5 6
HI LO HI
1st 2nd
1st 2nd
Low for Gradeability
7 8 9
LO HI LO
3rd 4th
Axle High
3rd 4th
10 11
LO HI
5th 6th
5th 6th
Speed
Axle
High