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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
There is a plug in the upper side of the diff housing on the drivers side, use a 3/8 ratchet and loosen the plug. Get some type of pump to put the 80/90 weight in the diff.
no..... you will need to jack up the car and look at the diff where it is connected to the driveshaft, look up above the driveshaft to youright a bit. I had to feel for the plug the first time I tried to find it, use a light as well, it will help..... Use a hydraulic jack as well. Just don't want you to get hurt with the wimpy jack that came with the car.