Did you put a new belt on? I was getting a lot of noise a couple of years ago and I removed the AC belt and it went away. I thought it was the AC tensioner but turned out to be the belt. I scuffed up the backside of the belt and put it back on(it was a Sunday and the parts places were closed) and it never made noise again. It could be your belt if you didn't swap it.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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