Ford F-650 2001 Owner's Manual page 89

Seating and safety restraints
Vehicle sensitive retractor
The vehicle sensitive retractor allows free shoulder belt length
adjustment to your movements and locks in response to vehicle
movement. For example, if the driver brakes suddenly or turns a corner
sharply, or the vehicle receives an impact of approximately 8 km/h (5
mph) or more, the combination safety belts will lock to help reduce
forward movement of the driver and passengers.
Front safety belt height adjustment
SuperCab and CrewCab vehicle has safety belt height adjustments for
the driver and front passenger. Adjust the height of the shoulder belt so
the belt rests across the middle of your shoulder.
• 4–door SuperCab
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