If it drives fine it was likely screwed up and "corrected" before you looked at it.
I wouldn't worry about it whinning unless it gets bad, they all whine to some degree. However I don't feel that the brand of gear has anything to do with it, people bitch about Richmond gears being noisey, but I had some and after changing the set-up a few times to perfect the tooth contact mine were dead silent until the pinion bearing started whinning again like they all do. I've done a ton of 7.5" 10 bolts and most of them are not perfect on the first set-up, most people are just too lazy to perfect it.