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for anyone interested, it looks like it's the chain drive in the transfer case...pulling down shortly...mechanic said sounds like what I was discribing...anybody know about this problem or is this abnormal...only75,000 miles on z71 Tahoe

Thanks for your reply...going to check those oyx sensors...that was just all replaced and we have a code being thrown on oyx sensor left bank...pulling the drive shaft tonight and running the tranny without hooked up to see if noise persist. thanks again Bill

I'de be really surprised but I've been fooled before...best to follow your gut feeling. Thanks for the reply

rattling noise coming from tranny while in gear and rolling jacked upped rear tires...noise is simular to a heat shield or cat converter pitch rattle...u joints and drive shaft seem solid and noise is definately forward...thanks for any help you guys can steer me toward. Bill

When driving or when rear jacked up sound comes from trans...front wheels or not engaged...shook and listened closly to drive shaft u joints...sound is more forward...sounds sort of like a flang around a exhast pipe or rattleing muffler or cat converter but shook all of those and by the way the...