Not modest. Honest. I saw mention of shimming the diff on the thread when I first joined in 2008, but no one was terribly clear on the subject. For a bunch of guys who are willing to share, there are still a few spots where they got stingy.

Bob (Granpa) filled me in on the trick about three years ago. My only contribution was drilling an access hole for adjustments, which would probably be illegal under TCS rules, so if you do it and get caught, I don't know you.