Oh hey, It was my BC anniversary. Thanks for noticing. I unknowingly celebrated by putting in a new radiator... but that'* another story.
It looks like it'll be worth looking into the bearing possibility. I'd have to try to get my hands on a puller and a heater. Not really sure where those can be found... any ideas there?
Would the bearing noise get louder with more load though? My noise is barely there when the lights are off, blower on low, etc. But it'* nearly as loud as a supercharger at 3/4 throttle breathing through a CAI, when everything is turned on. Would a bearing noise vary like that?
I also wonder if this can be done to all years/models. I know that the alternators on the new ones are different than on my '89.
Thanks for all of the info so far. If anyone has done this, and can give detailed instructions (or an opinion on how long it lasted, how difficult it was, etc.) that would be great too.