Need help with bearing noise

[haysonj]

I have a growling noise and need any info on how to isolate it. Sounds like a bearing but I have eliminated the wheels. I put it on jack stands put it in gear and checked with a stethoscope. No noise in trans and no noise at rear end, that leaves the 208 transfer case and the gear vendors OD. there is a lot of noise in both but they are connected with a solid housing. I drained and checked the fluid in both and no sign of metal. Before I start tearing into this does anyone have any ideas on how to isolate the noise. Thanks John