Damaged trans?

I did read the posting chris wrote. Everything mentioned is a 727. I guess the rotating mass of a 904 is alot less. So do it really need a new drum? A bolt in sprag? Everyone is doing these thing to a 727 but what about my little 904? While im in there I may as well do it I just need to know what to do. I want to thank you guys and fabo for all the knowledgeable people I love this site.