what will cause the transmission fliud to blow out the over flow vent tube

What is your question?

was take a little trip a couple towns over got about 30 miles into the trip when I started smelling the smell of transmission fluid like it was burning looked behind me and there was white smoke every where so I pulled over to find that there was trans fluid every where toe it home the next day try to find the problem and there are no leaks no where at all then I discover it has an over flow vent tube ...witch sounds a bit stupid to me it will move a little bit but you have to give it a lot of gas when you put it in dive to go it want move ...it yougive it a little push it will take off and go like its hanging up was where....can anybody tell me what cause this and if it is fixable or if I need to replace