so I recently purchased a 1999 Subaru legacy GT 5MT and the center differential is bad. It has all the tell tail signs, binding under tight slow turns, clattering when decelerating in gear, the hole nine yards. Does anyone have a good service manual or walk though on how to replace the center differential. I plan on doing it myself but I would like to know all the things I need to know first. Any tricky parts? special tools? things I need to watch out for? what should I replace while I'm there? Any help would be tremendous. Thank you