Yep you probably have the one that requires you to remove the muffler to remove it. If the bearing has not totally failed I would re-grease it. Just get a needle adapter at your local auto parts store, insert it between the inner bearing race and the seal lip and pump some fresh grease into the bearing. This is a how to on youtube.
https://www.youtube.com/watch?v=fl7cZBzjFVQ
I've done a few bearings this way like the idler pulleys and PTO's use a good quality grease.