Ford 2005 F250 Owner's Manual page 102

Seating and Safety Restraints
• 4–door Super Cab
To adjust the shoulder belt height, push the button and slide the height
adjuster up or down. Release the button and pull down on the height
adjuster to make sure it is locked in place.
Position the safety belt height adjusters so that the belt rests
across the middle of your shoulder. Failure to adjust the safety
belt properly could reduce the effectiveness of the seat belt and
increase the risk of injury in a collision.
Lap belts
Adjusting the lap belt
The lap belt should fit snugly and as low as possible around the
hips, not across the waist.
102
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2005 F250/350/450/550 (f23), Owners Guide (post-2002-fmt) (own2002),
Market: USA_English (fus)