There's also a tool called an impact driver. Put the socket on, put it on the bolt, and smack the end with a bfh. Can develop over 300 lb/ft on impact.

Be careful if you try to put a screwdriver or something to jam the flywheel. Good way to break off a tooth.

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98 XLT 3.0 manual 4x4 standard cab 6ft bed
RTFM!!!