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I use a 3/8 drive 12 point 3/4 inch socket on a long extension
with a ratchet handle. Some folks on the forum say its easier if
You remove right rear wheel but I have never found it necessary
to do it. Everyone on here seems to use a different wrench and
method so there will be many more answers.
I find You have to keep the socket really square on the plug,or it will
slip. On My 79 the reason the plug was so loose,the thick red plastic
posi. tag had got up on to the thread area of the plug crosswise and
the plug seemed to be tight but was really only screwed in a couple of
threads.When plug is plum tight tag should be loose on plug.Now You
should be completely confused.