2005 Tundra with towing package

I can't find the fill plug

 

It's inside the frame below the passenger seat.

 

Thanks very much (this particular fill plug was halfway up the transmission) as I’ve come to understand that many different transmissions were used for the towing package (I was pleasantly surprised that the fluid was not burnt or looking horrible) Now that I’m aware how to correctly service this transmission, I’m sure with my “Obsessive maintenance “ mannerism , This Tundra will stay “Rubber-side down” and continue to give me excellent service for many years- Thanks to all of the members of this “Fellowship “ for the “Jump in and share the solution” so we can get “Back in the driver’s seat” and continue to roll down the road