View Here : How To Rebuild Automatic Transmission
Both the automatic transmission (plus its torque converter) and a manual transmission (with its clutch) accomplish exactly the same thing, but they do it in totally different ways. It turns out that the way an automatic transmission does it is absolutely amazing!
If your transmission has a dipstick, simply pour the oil through the dipstick using a funnel. Once the oil is levelled… you’re nearly done. You see, when an automatic transmission is running, it pumps the transmission fluid around the transmission system, including the cooler and torque converter.