2 big problems with 2002 GT

[Technick]

Overhauling the trans involvs taking it out of the car, completely diassembling it, replacing any worn or damaged prts, cleaning it out, new gskts, seals, bearings, bushings, ect. and reassembling it. It IS NOT something you try to do unless you are extremly well versed in the workings of auto transmissions. Also there are usually special tools required that are not readily available and the re-assembly proceedures usually call for the tighting of fasteners is inch pounds, not foot pounds as in the average engine. So much more complicated, that is why even some Ford dealers do not attempt to overhaul them, they just replace it with a factory new or remanufactured one., In other words "don't try this at home". I hope this helps some.