I'll bet you were talking about the needle bearing. According to the 1995-2000 Fourtrax 300 Honda repair manual, it can't be replaced and you have to replace the whole case. I don't know why it says that because it's wrong. You can replace the bearing. Below are instructions for a Rancher 350 Repair Manual. Yours is the same process. I know this, because I've changed the pinion needle bearings before. The Rancher is the same process as the Fourtrax 300.