Dropping automatic transmission

Hello, everybody.

Unfortunately, my V8 needs some affection again, but this time in terms of automatic transmission.

After a short drive, it drips easily onto the connecting pipe to the cat on the passenger side, which is marked in the appendix. Under the F.A.Qs I already have an entry regarding. found the stub, but it's totally dry. This is 99% automatic oil, because I regularly check the stand with the measuring rod and have to pour it a little bit.

Do you have any idea where this can come from?