Ford 2002 F650 Owner's Manual page 146

Driving
BACKING UP
To avoid the possibility of personal injury while backing the
vehicle, always be sure your vehicle's path is clear.
Before backing your vehicle, be sure you can do so safely. If anything
behind the cab limits your view, do not rely on mirrors alone to assure
that your intended path is clear. If other persons are in the vicinity, have
someone standing well behind the vehicle and outside your intended
path - visible through an exterior mirror - guide you as you back up.
Although OSHA or other governmental regulations may require use of an
electrical or mechanical back-up alarm to warn bystanders, such an
alarm does not assure that the intended path is clear.
An electrical back-up alarm, if installed, is connected to the back-up
lamp circuit.
TWO SPEED REAR AXLE
General Information
A 2–speed axle allows the vehicle operator to select Low Range for good
starting and pulling power. The operator may also select High Range
which allows for greater road speed and economy.
High or Low Range can also be used to provide additional steps between
transmission gear ratios when either gradeability or economy are a
driving factor.
Axle upshift
Brake Torque
In any type of shift, you must brake torque your vehicle. This is done by
releasing the accelerator, because torque creates a binding action on the
sliding clutch gear. This binding must be relieved in order for the shift to
take place.
Axle upshifts transmission gears may be abrupt, causing the truck to
jerk. Using the clutch with the accelerator will smooth the shift.
In order to shift from LOW to HIGH,
• Pull the axle shift accelerator up.
• Release the accelerator.
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