im not sure if you got any answers yet but u have a 4t40e trans in that car, a little tuff and a little expessive. your best bet would be to try to get one from a junk yard. i work for a transmission shop and i would like to help u but i live in PA and im sure u dont. you always dont need a full rebuild ur best bet is to scan it for trans codes and do the engine codes too. that unit is electronic and anything could mess it up