I have a 96 dodge dakota 318 and the transmission is acting weird. When I am just driving it it Shits fine but when I beat on it it shifts into second but then it doesn't want to shift out of scond until I let off the gas. When it doesn't shift it just hits 5200 and the tac just bounces and you can feel it in the truck. And the only time it happens is when I beat on it. Anybody have any suggestions on what it might be?