Where do I find rear end wheel hubs and bearings? I think the rear passenger bearing is going bad on my 2004 sixer, but everywhere I go to find the whole hub, I only find front. So I'm assuming there isn't an actual hub, just the bearing?

 

Correct, pull the axles, fun.

 

you have a solid read axle. tires, brakes, diff cover, and axle shafts all have to come out to change the bearings. but.....the noise you are hearing could be those bearings, or the differential bearings, or even the gears making noise.

 

I'm also feeling some vibration in the rear. I can feel it through the seat, and the steering wheel as a sort of mild shudder. I attributed it to the bearings, when I changed the rear brakes in the spring. There was some minute play in the wheels.

I'm pretty much guessing this isn't going to be an easy fix.

 

if you feel a vibration in the steering wheel the tire balance is most likely the issue