What happens is the tranny shifts fine when accelerating to freeway speeds and continues to be fine until I let off the gas. When I get back on the gas the engine revs up about 200-300 rpm and then the tranny grabs and there's a very slight jerk when the tranny engages. The tranny fluid seems to be clean and at the right level. It seems to happen mostly at freeway speeds but it has happened on occasion driving around 40 mph. Anyone have any ideas? Any help is appreciated.