rear end noise

I posted about this on my post in the general board, but it was overlooked....

"i did have a little noise....it is quiet (as compared to the exhaust) and the sound is like ignition interference into the stereo, except I have no radio, so I know it's the rear, but maybe it's just new gears???"

but in addition to that....
The boooklet that came with the gear set has a nice little disclaimer in it....it says that in most cases, all aftermarket gear sets have some noise.....
anyway...thought i'd throw that out there....
but what has me concerned, if it IS a setup problem, is that the depth is engraved into the pinion head, but when I set it to that depth, it was WAAAAY too far away according to the pattern....so i set it up with a good pattern instead of using the given depth...and maybe that is what is causing the faint whistle
i think i can probably live with it because I barely noticed it and I had to hang my head into what used to be the back seat area and could barely hear it over the exhaust.....and all i have besides the factory sheetmetal back there is the fiberboard trunk divider.....i was mainly just curious about everyone's thoughts on it....