Wheel bearing.
Squeals when turning to the direction opposite of the bad bearing, ie., RF bearing is bad if it squeals while turning left and vice versa.
Replacing the bearing requires a shop press to disassemble and reassemble the bearing and hub from the knuckle. Certain auto parts stores (the ones that cater to the professional repair shops) often will provide this service for a fee if you buy the parts from them and bring the knuckle in. Look for parts store with an attached machine shop. This eliminates most of the national chains stores.
Steve
