Rear Differential Noise

[glav]

I am sure this question has been asked before, but I cannot find it. I have the 11. 5 AA rear end on my 2003 Ram 3500, ETH, DEE. I hear a noise coming from what I think is the rear end. It sounds like the tires are going across gravel sideways. It mostly happens when I have the fifth wheel trailer connected, however I have heard the noise sometimes driving solo. It only occurs when I am turning right or left. I thought that the rear end was making the noise via the cluthes, but the Trac-Rite doesn't have cluth plates, it has gears.

I am due for a fliud change and am going to do that, and hopefully that we be the cure. If however anyone has experieced this problem or event, I would appreciate your comments.

Thanks

Gene