On mine it was me and my buddies squealing like little girls when we heard the SC start to whine. I'm just kidding
Maybe you have a bad sepantine or idler belt, or maybe a tensioner/pulley??? Could you be more specific of where it is coming from, or when does it squeel (Ie; when accelerating, decelerating, idle)?
Mains and rods don't usually squeal unless your about to seize-up...and sometimes not even then...They usually chatter...Did you have any oil pressure????