I think it depends on just how "new" the gears are as to whether they have taken a set yet. Certainly wouldn't hurt to check the setup and see if something is whacky before you replace the gears.
I just replaced all the bearings in my diff that was whining badly (100+k miles). My whine was caused by sloppy clearances from worn bearings. Replaced the bearings, checked the setup ... absolutely quiet now. So I'm not sold on the idea that once they whine there is no curing them ... but then my gears were well worn, and had taken a good set long ago when the bearings were good.
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