1952-59 Ford Ford Overdrive upgrade

Check out Jim Shelley's wiring diagram. https://www.facebook.com/groups/fordyblock

 

I wish I was smart enough to figure out what he accomplished.

 

The link only takes it to the group.

 

Posted by Jim Shelley

 

The post is two days old and has fallen down on the page. Scroll down till you see Jim Shelley's post with the diagram.

Does anyone know what he accomplished other than being able to drop the OD out with a toggle switch?