So just had a used transmission put in my 2002 eclipse the guy i bought it from basically hustled me i guess i put in an older eclipse transmission which has a slight gear differenc and is causing my car to shift 1st, 2nd and then jerk into limp mode 3rd only. Can i figure out what PCM matches this tranny and put it in my car? If so do i have to flash it what???? Can someone please give me sound advice dont have the money to replace it what can i do?????