The noise is heard when you accelerate. sounds like a bearing combined with wind noise. Its very annoying, but hard for others to hear. Took it to the dealer twice. They could not isolate. The first time they said there was a service bulletin, and they changed the thrust bearing in the transfer case. The second time they scratched there head.

Please help

Hi,
on a 2004 under warranty they have to scratch their heads until it is fixed.
Bring it back, just be nice to them.
This will only get worse and more expensive.
Take care, Eggert :bananasmi