Advice req'd:- shaft spline wear / measurements / possible fix 722.118 transmission

[Stretch]

G'day Folks,

I've got a slight problem with a 722.118 transmission - BUT BEFORE YOU THINK oh I don't know about transmissions please read on because I'm looking for help with splines.

Statement of the problem:-

The only noticeable worn part on my transmission is a splined shaft in the front planet housing.



You can see in the picture above that there is a slight ridge in the first set of splines => towards the roller bearing race in the middle of the hole.

It looks to me as though the front planet housing has been shimmying on these splines as both sides of the splines are worn. As I've said before only the splines in the front planet housing are worn. The splines on the intermediate shaft (that fits into this bit) are fine.

Here's a picture of the two parts fitted together




Now the situation that I'd like to avoid is this one:-

722.118 Transmission problems, stripped out splines!

Where the splines have sheared right out of the front plant housing