I put one of those hoses on years ago but it might have been too late. I'm thinking like you, probably a bearing. I'll dive into mine this summer, once I get settled after moving.Hey man! I remember talking about that when you stopped over at my place - it was kind of a hot topic for me right then because I had just hit a trail with @overhanger and the noise was fresh in my mind. I have not opened up the transfer case I took out yet - probably sometime over the next year I will. My guess is that I got lazy about monitoring fluid levels and it toasted a bearing, causing something to get loose and rattle around. If the internal oil seal between the transfer case and transmission is leaking you pretty much have to monitor the situation weekly, and that’s a pain. If yours is leaking I’d get one of those hoses that shares the fluid and start planning some time for the rebuild. Happy to help with that or give pointers.