Thanks for all the input, and yes I have fluid in it. 85w140 lucasoil conventional with sure grip additive. I assume this is normal operation after consulting with the experts Dr. Diff and also Strange tech support got back to me rather quickly with their reply which also stated this is normal, especially during the break in period.

Still getting a noise from the rear end somewhere. I took the car out while the diff was cool, and immediately did a series of l & r tight circle turns. The noise was not present. So I continued to hit the highway for 10-20miles or so and tried the l & R tight turns in an empty parking lot and the sound was back! I think it has something to do with the rear end warming up, does it forwards and backwards. And yes there is sure-grip/limited slip additive in the rearend.....any thoughts?