Unknown part
 

https://cimg2.ibsrv.net/gimg/www.ran...015936d88a.jpg
Its located on the bell housing, has a plug screw in it and it appears to be hard rubber. I googled every number on it, closest i could find was a valley plug, but no photos could confirm.

Welcome to the forum

manual or automatic transmission ?

Year of the Ranger?
What engine size?

2009 automatic 2.3 XLT 4x2

So you have a 5R44E automatic transmission in a 2009 Ranger, which is the same as 4R44E or A4LD

Picture of drivers side here: https://shiftritetransmissions.com/w...55E_001-20.jpg
Picture of passenger side here: https://encrypted-tbn0.gstatic.com/i...ebjeNZcoIVRUME

Top here: https://encrypted-tbn0.gstatic.com/i...FkUa0eXGOBmPzS

So where on the bell housing is it?

The tube that runs up and down is the vent hose for the transmission