So people keep calling me and emailing me pics of their ring and pinion patterns and want to know which way to shim in order for the best pattern. Most are confused, looking at patterns in a manual and trying to figure out which way to move the gears. I'll have to admit it was very confusing to me the first time, and with the tools I had at the time it was a real B&#^%#$t. Eventually as I became for proficient at it, i noticed discrepancies in manuals, or at least ambiguity. The worst one, was when I had a pattern which the manual I was looking at called a "cross bearing" but did not say how to fix it. Basically the pattern was on opposite corners of the tooth. So after around 4 or five gear set ups in the front of my 72 Bronco the pinion race was rather loose, so i decided this would make it easy to make pinion depth changes, (sort of a reverse dummy bearing) and it was time to really figure it all out. Early on a Saturday morning, I began setting up a new gear set with no shims in the pinion but kept the back lash correct, I then added pinon dept shims .010" at a time and while keeping the backlash in the .006 to .010 range to see just how the pinion pattern moved. Ive been using this knowledge ever since and would like to share it with everyone. Recently I pretty much duplicated my original self taught lesson and here are the results.