I think there are (4) 1/2-20 standard thread rod ends on it. One rod, the one coming from the Ross box itself seems to have non-replaceable ends? The Ross box itself I think there are some kits for those on eBay
At this point, just the Ross box. Looking for seals, bearings, bushins, any normally worn parts.
About a quarter turn loosened in both the tractors. Both columns have loose wobble issues too.
I'll likely do the other parts with common store bought tie rod ends.
For a while there were a couple people offering kits on the bay but there doesnt seem to be anymore. But there is a Cub Cadet site that you can order individual parts (several of the other GTs used the Ross box - JD, WH, ford, etc)
You will need 3 things - the gear follower stud, the top & bottom bearings, and a gasket.
The follower stud needs to be the 9/16 size, not the 1/2 -- this stud will almost certainly be where your slop is coming from as it gets more and more worn.
The bottom bearing will likely be the only one needs to be replaced, its plastic cage goes to pieces and the balls get loose.
This is the web site, its a loooong list of parts so you will have to scroll down a long way to find the 3 items.