Thanks guys for all your replies. Here are a few answers to questions. Maybe this helps you help me possibly?
2000 Silverado
As Soon as I push button into Auto 4wd or 4WD High. I get the sound as soon as I start moving as well as going down the road.
It is Only in 4wd, not hearing a sound or feeling anything in 2WD.
Any other questions. Please feel free to ask.. I don't want to tear up the truck.. but with the weather outside- I'm in my 4wd all the time.
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