Bad knock in 2nd gear UPDATE

[firechief5215]

I finally got my transmission opened up and this is what I found, I cannot find any other damage that I can tell other than the teeth missing on the 1 gear. What would you due. would the transmission have to come out to repair this. And what would cause this Here is a link to my original post. http://www.fordbarn.com/forum/show.thread.php?t=178519 Thank you