My gears make no whine and were a awesome upgrade. If your gears start to whine right away very loud then most likely they were not shimmed right. And if you drive them for any extended period that way you will wear a pattern into the gears and they will never be quiet.
My gears where installed twice. Once with just swapping the gears and using the old shims and they whined. The second time they were sent to a driveline shop that made some custom shims and some little tweaks (not sure what they are).