Hey guys, I just finished replacing my ring and pinion on my 63. The rear diff is not original. It's a 8.2 10 bolt and I went from 4:11 to 3:36. I measured the pinion depth to within .0002 of within spec but I haven't been able to check the backlash. Anyway here's a pic of the diff with the backlash paint. I'm pretty sure about the pinion depth being within spec but I just want to be sure and hoping someone with a trained eye can see where I may need to make some adjustment. Thanks for your input. This forum has been a great help.