Ford 1998 Crown Victoria Owner's Manual page 108

Roadside emergencies
WRECKER TOWING
If you need to have your vehicle towed, contact a professional towing
service or, if you are a member, your roadside assistance center.
It is recommended that your vehicle be towed with a wheel lift or flatbed
equipment. Do not tow with slingbelt equipment. Ford Motor Company
has not developed or approved a T-hook or slingbelt towing procedure.
Before your vehicle can be towed, the air suspension control in the
luggage compartment must be turned to the OFF position (if equipped).
When calling for a tow truck, tell the operator what kind of vehicle you
have. A towing manual is available from Ford Motor Company for all
authorized tow truck operators. Have your tow truck driver refer to this
manual for proper hook-up and towing procedures for your vehicle.
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