Many Ford differentials have the fill plug on the front side - kind of hard
to see, but it's there. Look for a threaded hole. The plug has a square
3/8" opening, which may be filled with gunk. On my old LTD there is
anti-vibration weight attached to the diff, which gets in the way and needs
to be removed.
take it to a full service station(if you can find one)_ they will remove
the rear cover off the rear end, then put a suction tool in the opening
and suck up all the oil that is below the line of the cover plate...
then pump some more rear end oil into the rear end up to where the
bottom of the cover plate fits it... the put the cover plate back on....
or you can do it your self if you have a pump/suction removal tool to
get the old oil out....
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