Hoping to get some help on this one. Just changed trans fluid and filter on my "03 Caravan 3.3. now when stopping there is a hard downshift from 4th to 3rd. Used atf+4 and fluid level is fine. no other issues. did a search of the forum and it was said that the computer has to relearn what was done but I didn't quite understand. was wondering if anyone knows what would cause this. Thanks in advance