205 transfer case guru's needed....

I'm having a howling noise from about 45 up to about 65 with my 205 transfer case on my power wagon....
1974 divorce transfer case. Everything's new and I mean everything...
I've looked stuff up on the internet and getting everything from lowered the transmission and inch and a half to tilting back the transfer case which I take is tilting the bottom forward to pinion angle...
I'm going to try the pinion angle first because I have some shims but I still I'm not feeling it from there.. it really sounds as if it's coming from the transfer case...
Anyways all helpful ideas and suggestions welcome thank you...