I did this! I rebuilt my transmission without removing it from the car. I have to assembly only right side of my suspension and it is ready to go. But before I will do this, I have a question regarding transmission fluid flush. I would like to do this before test drive. So I want to connect clear hose to upper radiator connection and start the engine to remove about 1-2 of old fluid that stayed i torque converter and radiator. I already add about 6 liters of new oil. But I'm worry when I will start doing flush, my transmission will be without fluid because there is no return oil? Please correct me if I wrong.