Ford F series Owner's Manual page 113

While you are fastened in the seat belt, the
combination lap and shoulder belt adjusts to
your movement. However, if you brake hard,
turn hard, or if your vehicle receives an impact
of 5 mph (8 km/h) or more, the lap and
shoulder belt will become locked and help
reduce your forward movement.
Shoulder Belt Height Adjustment
(If equipped)
Driver and right front passenger
The driver and right front passenger shoulder
belt height is adjustable to one of five (5)
positions.
To adjust the belt down, push the release button
on the adjuster down and slide the adjuster
down. Then release the button and make sure
the adjuster is firmly in one of the positions. To
adjust the belt up, slide the adjuster up. (You do
not have to push the release button.) Slide it up
or down until the belt rests across the middle of
your shoulder.
Position the shoulder belt height adjuster
so that the belt rests across the middle of
your shoulder. Be sure the shoulder belt is
properly positioned on your shoulder each
time you use the belt. If the shoulder belt
is off your shoulder, on your upper arm
or neck, there is a greater risk of severe
injury in a collision.
NOTE: Be sure the belt is properly positioned
on your shoulder each time you use
the belt.
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