One problem related to noises during shifting has been reported for the 2003 Ford Explorer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Explorer based on all problems reported for the 2003 Explorer.
2003 Explorer's transmission made a loud "pop" or "whump" sound while driving about 20-24 mph. It was infrequent but alarming. The noise seems to be occurring when the vehicle shifts gears.