First I Was Wondering If Anyone Shims There Pinion? If So What Size Shim Do You Use? Since I Broke Mine A Couple Of Days Ago! So I Ordered The Hardened Metal Gears For Mine And Was Wondering If I Should Shim It Or Not. I Know It Helps On The Mgt. Second I Was Wondering What Diff Oil Wheight I Should Use For Bashing Not Raceing.