Squeaky Alternator and Upgrade?

Hello.
I have a 2000 Silverado RCSB 5.3L w/ ~103K mi.

I just noticed a slight, intermittent squeak coming from under the hood at idle and slow highway speeds (55mph @ 1500 rpm or so). Both the main drive and A/C belt were replaced ~5K mi ago when I replaced the water pump.

I suspected the alternator, so I removed the drive belt and turned the alternator by hand and could easily hear an intermittent squeak. I am still running the original alternator which has ~103K mi, so the bearings are probably getting worn.

Here go the questions......

Is it possible or feasible to replace the alternator bearings?

I am not certain but I may be running the standard 105amp and may want to have efans in the future.

What is involved with upgrading to the 130amp?

Anyone have any comments about re-manufactured AC Delco alternators?

Thanks.

get one off an 04ish tahoe...its a 145 amp i believe. it's a little larger, but fits right in. The belt SHOULD be .8 inches longer, but I was able to make mine work. Tensioner is at the edge of it's range, but i'll live with it.

Most alternators will squeak when spun by hand with no belt side load. Keep looking.

Idler pulley, bad tensioner..?..