GM rears are known for this noise it is usually caused by a pinion bearing that is coming apart or what they call bernelling ( I am not sure I spelled that correctly) it is little pits in the cones in the bearing it comes from lack of lubrication or the pinion seal leaking,you could pull the rear cover and drain the fluid into a dark pan and look for debris or alot of silver color.
Sounds like the brakes are bad metal on metal. How to find out. Jack up the wheel on the side the noise is coming from spin the wheel by hand,& have someone push the brake pedal by hand if it makes a grinding sound its brakes
change pads or shoes & have drums-roters turned &trued
Rear differential fluid is prolly low.park on level ground, clean around the fill/check plug, take it out and make sure fluid is at bottom of hole
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Pulled rear end totaly apart. Checked all bearings and races, smooth as glass. Replaced axle seals and pinion seal while apart. Gear oil looks fine. Running amsoil with posi additive. 268,000 miles on suburban with original rear and t-case. Just finished dropping t-case and going through it. Amsoil fluid like new no wear on anything except rear tail housing bushing which has a little pitting in the bushing on the top side. No play in the tail housing bearing or the drive shaft. Also pulled tranny pan which was clean as a whistle. Not even the gray residue on the bottom of the pan.
Replaced the brakes when check out the rear bearings. Noise still their.
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