I had my truck up on a hoist a couple of weeks ago as well. I posted earlier that the sound was wind howling between the tool box,and the bed-liner. I just had to replace the clutch,at another shop. When they test-drove it,they said that my carrier bearing was screaming! It would only make a racket while under-load. It didn't even whisper,on the hoist!! They can be deceiving!
