Ford F series Owner's Manual page 238

Eyebolt position
Underbody spare tire carrier
When the truck is ordered with a spare wheel
only (no tire), it is stowed with a wood spacer
in the usual spare tire location. Remove the
wood spacer before installing the spare tire and
wheel.
After the spare tire and wheel are stowed, adjust
the driver side channel ball end bolt and the
eyebolt as necessary until the tire cannot be
moved by hand pressure.
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