I sell more Sierra Gear ring and pinions then anything else... about 5-6 sets per week latley. Since we started selling the Sierra's a few years back, we have had zero complaints. Not sure where some of them come from, but I know my Sierra Gears in my Landcruiser had OEM markings on them from a Japanese gear manufacture... Good Stuff
If anyone want to take a look at Sierra gears or install kits, I have several different ones here that I am waiting on customers to pick up. Check em' out