ford tranny's suck. they put three of them in my bullitt. the third is a tremec spec not a ford spec and i havent had any problems with it yet.

i have talked with tremec and they recommend you use syncromesh tranny fluid and stay away with synthetic(sp) with their trannys. so thats what i made ford put in mine the last time. i had to have a letter from tremec telling them to put it in there.

good luck and i am sorry to here you are having these problems i know how ford is when you have to get something replaced more then once. right now im fighting with them over my head lights.