TH400 manual valve circuits 

thanks for sharing knowledge!!

Thank IV been looking for a flow diagram so I can get a better idea of how it function not just how it all goes together

good job explaining, maybe could you make a more in depth video? I'm trying to make sense of what is happening inside my th400. It's black magic!

Could you explain this but in a reverse pattern valve body?

What causes the vent tube to leak fluid at idle, bought used th400 was supposed to be working in previous vehicle, has a trans-brake also.