Help noise problem

Hi guys new to the forum. I need some help to fix my truck I spend over 1k already and still not fix the problem. I wish I should should gotten it professionally diagnose but I want to see if any one here can help me first. My problem is a grinding squeaking noise and when I put it into four-wheel-drive it will stop squeaking and grinding but now it's gotten really bad with the noise. It's funny that it happen mostly when I'm driving in the mountain where there sharp turns and uneven road. Any help is appreciated.

 

Can you provide more detail about the noise and the truck? I'm not clear if you mean it's a 4wd or 2wd issue. Where's it coming from? More specific details may help clue one of us in it.

 

My truck is a 4wd and the noise coming from the front. when I'm in 2wd especially when I'm in the mountain driving the noise happen all the time but if I shift into 4wd the noise go away. It's a grinding squeaking noise.