Hello, I have a 2007 Mercury Moutaineer AWD with a V6 and aprox. 47,000 miles. Just recently when I am slowing down at exactly 20mph the transmission will downshift hard. Not extremely hard, but enough that I know something is wrong. I have no check engine light and I have had the vehicle looked at by Ford mechanics who say there is something wrong, but they don't know what. I am at a loss! Please help. Thanks