Recently noticed a bumping noise when the gears change, especially when shifting out of Park into Drive or Reverse and sometimes while driving. It's as if the transmission is under a lot of pressure or there is a loose linkage in there somewhere. So the transmission is functioning properly when driving just this occasional clunking noise when changing Gears. I drive with a heavy foot so even the slightest stalls bother me especially driving the very busy fast Freeway. Our Pacifica has around 22,000 miles on it so it's still under Warranty and I intend to take into Service Dept. I just want to know if any other owners out there are or have experienced this bumping noise when the gears change.