Fj40 transmission adjustment screw? Possibly

[fraserb]

While cleaning and installing dynamat I found what appears to be some sort of adjustment on my transmission. Searched the forums couldn’t find anything.
Anyone know what this is?

 

[fjc-man]

Unless in the process of being overhauled and set up, probably best left alone.

 

[fraserb]

Unless in the process of being overhauled and set up, probably best left alone.View attachment 2910008

Hahaha brilliant. Thank you!!