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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.
When I did my buddys, we used the plug on the side. We just used something to suck it out of the bottle and into the tranny. You can fill it through the shifter area, it just takes foerever, IIRC.