Squealing and airplane noise.
 

Hi, I have a problem with my 1996 4x4 4 door Blazer squealing. It's a high pitch squeal that almost rattles if you listen closely. It only happens when I have my blazer in drive or overdrive.

When I break, the squealing goes away completely (even when slowing down but not stopping) until I begin to accelerate again.

I also have an airplane noise that only happens when I decelerate. It stops around 10-15 miles per hour. Only happens in drive and over drive as well. As the speed slows down the noise gets lower in pitch. I didn't have the airplane noise until I took it in the shop and had my lower intake manifold gasket replaced. I checked transmission fluid and it seems to be very dirty and a little low. I'm going to get that filled and changed. Another thread suggested it may be a 4x4 issue on the airplane noise and suggested switching from 2 hi to 4 hi and low then back.

may have a bad wheel bearing ,,

I filled the transmission fluid and now you can only hear the airplane noise if you listen very closely.

I spoke with a few mechanics and they all agree that the squealing noise is either a brake or bearings issue. They said it's likely bearings because of the behavior.

You find out anymore about this? I had this happen twice so far! I'll be driving on the freeway and hear a humming sound then when I get off the exit ramp and start slowing down it gets louder and louder and lower in pitch until I stop and its almost like something "POPS" back into place and then its good. And this is on the pass side where my suspected bad wheel bearing is on the drivers...