Hi Doc. Changed my diff oil a few months ago. I didn't notice any shavings and didn't notice any wear problems either. Really do like the Wavetrac. It made a real difference in stability during rapid acceleration events. Used to be that the car's rear end would slip off to the left (my left when sitting in the seat) before snapping back. But since I installed the Wavetrac it has been only a straight movement forward when the rear wheels are spinning on launch. Looking forward to your update, and your assessment regarding shavings or wear.