Ford F-650/750 (2018 year). Manual — part 28

With the gearshift lever in drive (D), press
the – button to activate SelectShift. The
instrument cluster indicates the available
and selected gears.

All available gears display with the current
gear indicated. Press the – button again to
lock out gears beginning with the highest
gear. Example: press the – button twice to
lock out 6th and 5th gears. Only the
available gears display and the
transmission automatically shifts between
the available gears. Press the + button to
unlock gears.

By moving the gearshift lever from the drive
(D) position to the manual (M) position
you may now manually select the gear you
desire. Only the current gear displays. Press
the + button or the – button to upshift or
downshift. If you press the – button at a
vehicle speed that would cause an engine
overspeed, the requested gear flashes then
disappears and the transmission remains
in the current gear.

Recommended shift speeds

Upshift according to the following chart:

Upshifts when accelerating (recommended for best fuel economy)

Diesel engines

Gasoline engines

Shift from:

12 mph (19 km/h)

15 mph (24 km/h)

1 – 2

19 mph (31 km/h)

25 mph (40 km/h)

2 – 3

26 mph (42 km/h)

40 mph (64 km/h)

3 – 4

34 mph (55 km/h)

45 mph (72 km/h)

4 – 5

46 mph (74 km/h)

50 mph (80 km/h)

5 – 6

In order to prevent the engine from running
at too low an RPM, which may cause it to
stall, SelectShift still automatically makes
some downshifts if it has determined that
you have not downshifted in time.
Although SelectShift makes some
downshifts for you, it still allows you to
downshift at any time as long as the
SelectShift determines that there is no
damage to the engine from over-revving.

SelectShift does not automatically upshift,
even if the engine is approaching the RPM
limit. You must shift manually by pressing
the + button.

Note: Engine damage may occur if you rev
the engine excessively and hold it without
shifting.

Automatic Transmission Adaptive
Learning

This feature's design is to increase
durability and provide consistent shift feel
over the life of your vehicle. A new vehicle
or transmission may have firm shifts, soft
shifts or both. This operation is normal and
does not affect function or durability of the
transmission. Over time, the adaptive
learning process fully updates transmission
operation. Additionally, whenever you
disconnect the battery or install a new
battery, the system must relearn the
strategy.

Brake-Shift Interlock

(If Equipped)

WARNINGS

Do not drive your vehicle until you
verify that the brake lamps are
working.

When doing this procedure, you need
to take the transmission out of park
(P) which means your vehicle can

roll freely. To avoid unwanted vehicle
movement, always fully set the parking
brake prior to doing this procedure. Use
wheels chocks if appropriate.

If the parking brake is fully released,
but the brake warning lamp remains
illuminated, the brakes may not be

working properly. Have your vehicle
checked as soon as possible.

Your vehicle is equipped with a brake-shift
interlock feature that prevents the
gearshift lever from moving from park (P)
when the ignition is in the 3 (on) position
and the brake pedal is not pressed.

If you cannot move the gearshift lever out
of park (P) position with the ignition in the
4 (on) position and the brake pedal
pressed, a malfunction may have occurred.
It is possible that a fuse has blown or your
vehicle’s brake lamps are not operating
properly. See Fuse Specification Chart
(page 165).

If the fuse is not blown and the brake
lamps are working properly, the following
procedure allows you to move the gearshift
lever from park (P):

1.

Apply the parking brake. Switch the
ignition key to 1 (off), then remove the
key.

2. Move the steering column to the full

down and full rearward position
(toward the driver’s seat).

3. Remove the gearshift lever boot.

4. Place fingers into hole where you

removed the gearshift lever boot and
pull top half of shroud up and forward
to separate it from the lower half of the
shroud. There is a hinge at the forward
edge of the top shroud. Roll the top
half of the shroud upward on the hinge
point to clear the hazard flasher button,
then pull straight rearward toward the
driver’s seat to remove.

5. Remove the top half of the shroud.

6. Remove the three fasteners under the

column that secure the lower shroud
half to the column.

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7.

Pull the lock lever into the full unlocked
position and remove the lower shroud
cover by pulling the lever handle
through the slot in the cover.

8. Apply the brake. Gently lift the override

disk and move the gearshift lever into
neutral (N).

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9. Start your vehicle.

Perform Steps 4 through 8 in reverse order,
making sure to engage the hinge pivots
between the upper and lower halves of the
shroud. Keep slight pressure in the forward
direction as you rotate the halves together.

If Your Vehicle Gets Stuck In Mud
or Snow

Note: Do not rock your vehicle if the engine
is not at normal operating temperature or
damage to the transmission may occur.

Note: Do not rock your vehicle for more
than a minute or damage to the
transmission and tires may occur, or the
engine may overheat.

If your vehicle is stuck in mud or snow, you
may rock it out by shifting between forward
and reverse gears, stopping between shifts
in a steady pattern. Press lightly on the
accelerator in each gear.

POWER TAKE-OFF

Auxiliary equipment called power take-off,
or PTO, is often added to the engine or
transmission to operate utility equipment.
Examples include a wheel-lift for tow
trucks, cranes, tools for construction or tire
service and pumping fluids. PTO
applications draw auxiliary horsepower
from the powertrain, often while the

vehicle is stationary or mobile. In the
stationary condition, there is limited
cooling air flow through the radiator and
around the vehicle that normally occurs
when a vehicle is moving. The aftermarket
PTO system installer, having the most
knowledge of the final application, is
responsible for determining whether
additional chassis heat protection or
powertrain cooling is required and alerting
the user to the safe and proper operation.

Your vehicle is approved for use as a
Stationary Mode, SplitShaft Mode or
Mobile Mode power source within the limits
and operating guidelines detailed in the
Ford Truck Body Builders Layout Book,
found at
www.fleet.ford.com/truckbbas.com and
through the Ford Truck Body Builders
Advisory Service. The transmission power
source modes are engine specific.

GENERAL INFORMATION

WARNING

Exceeding these ratings by
overloading can cause component
failure resulting in property damage,

personal injury or death.

Fluid Temperature

If the operating temperature exceeds
250°F (121°C), the rate of axle lubrication
oxidation increases and shortens the life
of the lubricant and seals, requiring axle
lubrication changes to become more
frequent to preserve the axle. Do not
consistently run extreme pressure (EP)
lubricants above 250°F (121°C).

Axle Conversions

WARNING

When operating a loaded vehicle, the
driver must keep all adjustable axles
on the ground at all times, supporting

their share of the vehicle’s load. Failure to
do so can overload other axles, tires,
wheels, springs, steering components,
brakes and frames, resulting in early
component failure, loss of vehicle control,
possible property damage and personal
injury.

We do not recommend, or approve,
performing axle conversions. However, we
understand that, on occasion, others install
aftermarket add-on axles on the truck
chassis that allow operator control for
weight transfer from other axles (such as
air lift axles).

LIMITED SLIP DIFFERENTIAL

(If Equipped)

WARNING

If both wheels are not raised off the
ground, the one wheel that is not
raised may pull the vehicle off its

support, possibly resulting in personal
injury.

This axle provides added traction on
slippery surfaces, particularly when one
wheel is on a poor traction surface. Under
normal conditions, the limited-slip axle
functions like a standard rear axle. The axle
may exhibit a slight noise or vibration
during tight turns with low vehicle speed.
This is normal behavior and indicates the
axle is working.

Both wheels must be raised off the ground
should it be necessary to operate one
wheel with your vehicle stationary.

ELECTRONIC LOCKING
DIFFERENTIAL

(If Equipped)

Driver-Controlled Locking
Differential

Note: Never use the differential lock at
vehicle speeds above 25 mph (40 km/h).

Some drive axles have a driver-controlled
differential lock. The differential lock can
lock or unlock the differential when your
vehicle is moving or stopped. When extra
traction is required, the differential lock
provides full power to both wheels.

When you lock the differential, your
vehicle’s turning radius increases
(under-steer).

Take care to avoid sudden accelerations
when both drive wheels are on a slippery
surface.