I recently acquired this 2.76 differential with the intention of swapping it out for the open unit in my NY. This weekend I built a holding jig and started to clean it up a little. I was hoping to just clean and paint, as it seems pretty solid and the backlash is tight. Also planning on replacing the pinion seal... Inspecting the ring gear a little closer, there are strange marks on the drive side of the teeth. The pinion doesn't appear to have them. I am wondering if this is "ok" or should I replace? I might be able to swap with the existing 2:76 set that's in the car now, if those are any better. Any gear experts on here that could interpret this? Besides the gears, bearings, case, how does one inspect the limited slip unit?