Now I know why 904 was having issues

Almost done cleaning parts with new stuff on the way. Tell me about these thrust washers. The one with the most wear was inside the driving shell, the other faced it on the outside. I'm guessing the inside one needs replacing. Seems like that could be a source of end play. Speaking of the driving shell, (hope I'm getting these part names right) do I need to remove the sun gear from it for proper cleaning? Not sure how to get at the snap ring holding it in there. Please advise.