Weird knocking under heavy load

[ricardo-cr23]

Hello! I have a Yaris 2007 sedan 1.5L V4 US version with 190k miles on it. Since I own the car (5 years) I notice that the car does a knocking inside of the Transmission while the engine has been running for some time. Also it sounds while the AC is on, but when I turn it off, the knocking reduces (I am completely sure that the knocking comes from the transmission area and not the compressor / pulleys.

Here's a video of the knocking in the area I hear it: https://youtu.be/TmWVjV2vByQ

Any thoughts?

[ricardo-cr23]

Up!

[Sharky808]

Honestly hard to say without someone to look at it. If for sure trans area and its an Auto could be anything from a Torque Converter issue to a broken Flex Plate or bearing issue.