Odd bolt on top of transmission?
 

Saw this today- it doesn't appear to be a bolt, more like a cap. It feels spring loaded when you push on it and it turns freely (i.e. doesn't tighten or loosen). I may get laughed at but ...what is it? :haha:

I highlighted it in red. Sorry in advance for my noobness. Will be donating soon.

Thats a breather for the expansion of the fluid in the transmission.

Its the breather for the trans

You have your answers.

/thread.

It's the engine reset button for when you vent the block.

i too discovered this.... so i assume it should move freely... thought it was the cause of my slight rattle noise

nope that slight rattle noise is straight from the factory.

Flux capasitor.....old thread

It's spring loaded so when you ford a water crossing that's deeper than the the vent it'll close and keep the water out. :lol: A good reason not to have a CAI