The 7AT transmission gets the fluid added through a plug that is on the pan. The fluid has to be pumped into the transmission. This of course requires a special tool. Once you have that tool, you can pump fluid into the trans and then let the car run until it's up to temperature. Once warm, you open the fill plug back up and let the fluid drain out until it slows to a steady drip. Then it's full. It has a tube inside the pan that sets the level. No need to check it unless you have a leak. No need to service it as it's designed to go over 150K without being changed.
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