Ford 1996 Crown Victoria Manual page 281

Snow Tires and Chains
The tires on your vehicle have all-weather treads
that provide traction in rain or snow. However,
during the winter months in some climates, you
may need to use snow tires and occasionally
chains for your tires.
Snow tires must be the same size and
grade as the tires you currently have on
your vehicle.
Use chains on the tires only in an emergency or
if the law requires them where you live. If you
choose to use chains on your vehicle's tires, be
aware of the following:
Make sure the chains are the right size for
your tires. Use only SAE Class "S" chains.
Other types may damage your vehicle.
Put the chains on tightly with the ends held
down securely. Verify that no chain touches
any wiring, brake lines, or fuel lines. Follow
the chain manufacturer's instructions.
Drive slowly. If you can hear the chains rub
or bang against your vehicle, stop the vehicle
and tighten the chains. If you continue to
hear the chains rub or bang against your
vehicle, remove the chains to prevent damage
to your vehicle.
Avoid fully loading your vehicle if possible.
Remove tire chains at the first opportunity
after using them on snow and ice. Do not use
the chains on dry roads.
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