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Take the rubber plug out of the bottom of the bell housing. Rotate the tq converter until the plug lines up with the hole. I think sometime in 03 Ford quit using tq converters with plugs so you may not have one.
It is hit or miss if it has one. I haven't seen one on most of the later trucks including my old 97 PSD. My guess is they stopped in the mid 90's, but I also stopped looking for the most part.