'90 Amigo horrible rear end squeal

i recently bought a 1990 Isuzu Amigo and i love it. The car runs fantastic and looks great, but i have found a problem. There is a horrible sqeual that seems to come from the rear end, maybe the axle? The noise started out only sometimes (usually in 3rd and 4th gear) but has become a constant annoyance. The squeal goes away in left corners and becomes worse in right corners. Some have suggested a bad bearing?, any help or info is appreciated.

well i would have to say deff. rear er end needs to be changed my isuzu started squeeling like that replaced it and problem fixed