2006 Toyota 4Runner - front axle noise?

what could cause a worn out bearing kind of noise around the front axle. I changed the wheel bearing and my mechanic confirmed that my front Axle is ok. he mentioned something about a bearing in the 4X4 box. Please need your help the sound is like woooooo and louder when driving in the street (low speed) and windows up.

I’ve heard bad engine mounts mimic e wheel bearing noise