my dads 97 continental he says is starting to shift worse. When you get just about to stop sometimes it drops into 1st. Also he says when letting off the gas it seems to kind of clunk or drop into the next gear. It has around 70k on it and I told him to get the tranny fluid changed. He said oh that might make it worse. Is that only on the old pan drop style or anyplace that does a cleaning flush before the exchange, or not at all?