Originally Posted by obby
most transmissions do not have a drain plug. You have to take dowm the pan and change the gasket. There is also a filter that can be cleaned or changed. It's not like an oil change.
tomorrow is the first day of the rest of your life Ediabas OBDII interface
I am not sure that I totally agree with this comment. Most tansmissions do have a drain plug, but it may not be in the most obvious position. Sometimes the fill plug is in the middle of the base of the pan, but the plug has a short section of tube above it which acts as a self limiting full level indicator, i.e. you fill the transmission until oil overflows back out the plug hole that you are using to pump oil in through. The drain plug can sometimes be positioned at one end of the pan rather than the bottom, its low enough to allow you to drain the majority of the fluid, and then drop the pan without showering hot transmission fluid over yourself. Change the filter each time and stay with the OEM filter products. Make sure you source the correct oil, or a proper equivalent.
As LV said, the service cycle of trans fluid changes should take into account your driving style & conditions, as well as the age and mileage of the car, I aim for a 40,000 - 60,000 km cycle.