2010 automatic trans question

I know, I know. This is for Shelby's, but I don't belong to a mustang forum. I know somebody can help. My son did his first oil change yesterday on his 2010 mustang. It was a rental car, now it's his baby. I showed him what to do, but he drained the trans fluid instead of the oil. I managed to pump trans fluid back into the smaller hole (my first time for this). He told me the plug he removed had a tall threaded tube on it. Do I understand that this is an overflow to set the level of the fluid? Do you pump in fluid, remove the hose, and let it drain to achieve the correct level? Thanks, Brian

 

Thanks for the post. That's what I thought. We are going to raise the car this Saturday and drain some fluid. I pumped in about 5 quarts and when I pulled the hose the stream was pretty good. Thanks again.