transmission Help?

[BManier]

ok guys I had to take off the back of my NV5600 houseing. I know how that goes back on and everything but a small metal ring fell out when I took it off. It looked like it is about a 1/4 inch across with about an 1/8 hole. I was hopeing some one knew where it goes? I can't find it in any diagrams.

 

[BManier]

Does any one even have a good referance for diagrams on this transmission?