it's pretty much like what they did with dextron 3. dextron3 can be used in any tranny that calls for the lower of it. i am pretty sure that you can mix atf+4 and atf+3 but i would check with chrysler to make sure.


oh and if you go to superlube to get your tranny done, don't cause they only use dextron3/mercon in the tranny and add a stabilizer to adjust it to what your car requires. my tranny has been slipping every since. i am taking it there and telling them it's slipping on me since.