My D16Y8 tranny had shot bearings so i took the battle axe approach and replaced the entire tranny. I went this route since rebuilding takes time and is not cheap. The tranny swap was pretty straightforward and I swapped the clutch/throw-out bearing/etc all at the same time. A few hours is better than not having your car for a week if not longer.

Check various Honda forums, thepartstrader.com, and salvage yards. I got a same year Y8 tranny with same miles for only $200 w/90-day warranty.