Review on 🔧 USA Standard Gear (ZK GM8.6) Complete Overhaul Kit for GM 8.6 Differential by Ray Cole

Not sure why this kit is so cheap. High-quality Koyo bearings made in Japan and the USA are used. The only reason I see the low price is because the kit didn't come in the original box. However, the seller included the end cap in the original box with the US standard gear number and description. I just found out that the "YK" kit is almost 4 times more expensive than this "ZK" kit, probably because it uses Timken bearings. It doesn't make sense to me because Timkens can be made outside of the US and I don't see how they can be significantly better than American or Japanese made KOYOs. And I read that KOYO is used in all kinds of Japanese cars and trucks. Maybe someone will enlighten me.