Big Der

I had similar issues and got a used transfer case from benzeen auto for about 1400. I had to used my original computer box which is attached to the transfer case. The one which came with the used case was faulty. Everything works great ever since. Have a mechanic who knows there stiff do the job. The labor is about $450. Did this two years ago without any other issues with the noise which usually happens at 65mph and above. My vehicle now has 314k on it.