8 1/4 axle inspection.

I recently had my 8 1/4 redone with 3.91's. I found some US gear ring & pinion set. The USA gear you mention I think is not really from USA! US gear has been around a long time made here. However, it is not really easy to come by. Found mine on ebay and were the only ones. Try to find Richmond gear, Motive gear or US gear can be had from Toms differentials. Just look up Toms online. Try to stick with a known brand. Better if made here or even Mexico. But try to avoid ones made in Asia or India!