727 doesn't want to move

Still having issues with my tranny. It's a 727 with a reverse manual valve body. It won't move in any gear it will just rev. I've tried changing the filter and that didn't work. Before it would move but it seemed like it was slipping real bad so I changed the fluid and filter and now it won't move. This is what I see when I check the fluid. As you can see the fluid gets washed away on the front side but on the back it is full of bubbles. It is right at the ok mark on the stick when hot so there's enough fluid in there so I want to see what you guys think I'm stumped!