Help with a Ford

You should either have an NP-435 or a T-19 transmission in your truck. I don't however see anything similar in any of the diagrams to the picture you're showing. Take a look at the links below, maybe I missed it.

http://www.blueovaltrucks.com/tech/transmissions_manual.htm
http://broncograveyard.com/images/addon/np435shfthsng.jpg
http://www.offroaders.com/tech/Diagrams/T19.htm