trans fluid on 2004 Lincoln Aviator

im told that to refill the transfluid that you fill from the drain plug but where is the fluid going to come out of when you get it full

Asked by for the 2004 Lincoln Aviator
You actually do not fill from the drain plug. You fill into the fill plug.

The fill plug takes a special service tool fitting that goes in to allow fluid to be "injected" in little by little. Some shops use this adapter with a power steering fluid exchange machine to add fluid (using Mercon V fluid of course) in order to accelerate this process.

The transmission is full when at the fill hole fluid starts to overflow.