8 3/4" 741 why this happen

Couple of pics more.
That cross shaft slot or groove, what ever it is, was 1.46" another side and 1.41" another.I think it should be around 0.800"?? Cross shaft -> case gap was 0.55". Another pinion on cross shaft was tight and another was loose, and looks like there should be lock pin in cross shaft, but i cant find it??? Junk #-o