8-3/4 Noise After Rebuild..What's Normal??

I was told that they're Mopar High Perf. gears, although they haven't produced the paperwork I was promised....They'd better pretty soon though.......

They've put no additives in the rear.......straight 90 against my wishes....I asked if they could put in the royal purple, but I guess they didn't have the time to monkey with it........(ain't customer service grand sometimes?...)

So, with a rebuild, new 3.55 gears set and bearings, what's normal?? What should I expect, and what about a "break-in"............will it quiet down a little more?.......................

Come on......I need input....................:drinkers: