Ford 2007 F-650 Owner's Manual page 123

Driving
A parking pawl effectively grounds the transmission's output shaft
preventing rotation of the driveline. If the vehicle is stationary, selecting
the P (Park) position places the transmission in neutral and engages the
parking pawl (always use the parking brake, also).
Note: If the P (Park) position is selected when the vehicle is in motion,
the parking pawl mechanism will ratchet and NOT hold the truck.
Always set the parking brake fully. Do not use the gearshift in
place of the parking brake.
To avoid sudden, unexpected vehicle movement and
possible personal injury or death:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into P (Park). Slowly lift your foot from the
brake pedal to engage the transmission parking pawl mechanism.
3. Apply the parking brake and make sure it is holding properly. Do not
rely solely on the parking mechanism of the transmission.)
4. Turn the engine off when you leave the vehicle. Never leave the
vehicle unattended when the engine is running.
Allison 2500 automatic transmission
This transmission is available with a column-mounted gearshift lever. The
gear positions are displayed on the RNDL in the instrument cluster.
To avoid sudden, unexpected vehicle movement and
possible personal injury or death:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into N (Neutral).
3. Apply the parking brake and make sure it is holding properly.
4. Turn the engine off when you leave the vehicle. Never leave the
vehicle unattended when the engine is running.
Allison 3000 Series automatic transmission
Two modes are available for the Allison 3000 Series: Performance and
Economy. Performance mode will give you the best all-around
transmission operation; Economy provides operation at lower engine
122
2007 F-650/750 (f67)
Supplement
USA (fus)