2007 Chrysler pacifica 4.0l awd slipping

generally speaking, automatics slip because the ATF is old or it is simply dry. All cars need to be serviced and maintained properly to operate and function properly. The best way to check the ATF is when the motor is warm. you never get a proper reading when it is cold ( buy the motor oil you do. check with a dealer to see if there is a recall for the transmission and be prepared to give them the VIN. If they tell you you are better off getting a flush of the ATF, I would do the same but DON'T do it at the dealer. It's WAY too expensive. and yes, change the filter too. it'll run about $210 to $230