Basically, should I go with Yukon gears or 'Geniune Gear' brand?

I need new ones because there's a spot on the ring where there's no backlash, so it causes this horrible, loud vibrating noise. However, is it possible that the gears will sort of wear into themselves and that after a few hundred miles I won't hear the noise anymore? The dealer claims it's fine to drive.

 

The gods honest truth is that both brands are the same. They are all made in the same factory in South East Asia. The metal is the same. The only diffrence is the "pro or hardend" ones. They have more run in which means that the ring and pinon were mated and run together on a machine to get them to "be more freindly" ie quieter and with a better pattern. I used to work at 4wheel parts. We had both Yukon and Genuine Gear. the boxes they came in, the numbers on them, everything were the same. The owner of the company Greg Adler, used standard Genuine Gear gears in his race truck. When it comes to Cryo Treated they are harder but will not last any longer then normal. They just resist shattering better. If any of thiscan help you then, here you go.I might be slightly off but i know that the basis is right. please correct me if i'm wrong.

 

I've heard Yukon gears have really good instructions if you're going to be installing them yourself