OK, this is what I need to know since Emiss laws have got real ghey to where they scan your car for codes now. The car is a 1997 Mustang GT BTW.
I did a 4R70W to TR3550 swap back in like 98 or 99. I was told by Barry Shepard at the WFC1 in KY that the trans isn't controlled by the ECU, but is...