Unfortunately, it looks like someone over tightened it at one point which caused it to be stripped out when trying to remove it later. Or they just didn't use the correct ratchet to remove it and rounded it out.
https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid
Basically, at this point you need to do anything possible to get it out and not worry about destroying it more otherwise you are looking at replacing the whole thing and clearly that is not desirable.
What I would do is take a short 1/2-inch socket extension and hammer it into the plug and then support it with your hand so that it stays straight and doesn't twist out and just put steady pressure on the plug. Use a longer ratchet so that you can have more leverage which will help with keeping it straight and not twisting out.
However, before you do this, get a new plug so that you are ready to go with replacing it the correct way.
If this doesn't work, then you are looking at trying to weld a socket to the plug and removing it that way.
Let me know what happens and we can go from there. Thanks
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Wednesday, November 10th, 2021 AT 8:29 AM