Try what you have first since it's already there. I just know from personal experience that any other than MOPAR ATF+3, my car would shift and it felt kind of off as if I had a shift kit in there (kinda hard shifts). Once I replaced it though, it was great again. I've also noticed that other cars with the A604 had similar problems with other ATF+3 fluids. The A604 is just picky..damn engineers again.