2004 Chrysler Pacifica transmission problems

Car rolled backward down drive way while car was in park. My wife was almost run over as she was standing outside the driver door while the door was open. The car rolled down the driveway (2% grade), into the street with the driver door open and pushing my wife into my neighbor's mailbox and up my neighbor's curb.

Leased pacifica 7-2004. By 11-2004 9000 miles started makeing loud popping sounds from front end. Dealer tryed to concel problem with pto unit that they knew was faulty, after taking car home, on a we had to order new part they let me drive this car with no repairs made at that time. 2 weeks later we contacted the service director and he reveled the problem and part was replaced. Now in may 2005 it is making loud thumps in the front end when decelrating and acelerating car is at the dealership at this time.