Gear Heads, My purchase of a set of FRPP 4.09s fell through. eBay seller hadn't updated that it was already sold (don't you love that). In any case, after researching, I've discovered a few things. 1. US Gear is the manufacturer for what was previously the only option for FRPP 4.09s for the super 8.8 rear. The part number is their old part number which apparently translates to their new "stealth" line of gears. US Gear claims that their multi angle cut process results in quieter gears, better engagement, etc, etc. 2. US Gear has recently developed an additional line of products they call "lightning" series which is a special finish/treatment that allegedly has several benefits such as no break in, more quiet, longer lasting, cooler running, etc. 3. US Gear is also offering other ratios such as 3.90. 4. Even steeper ratios are offered through Yukon (such as 4.30 and up) but I wasn't interested in that drastic of a swap so i haven't researched them. Assuming that there'll be no noticeable difference between 4.09 and 4.11 in terms of rpm/speed, and swapping from 3.73 to 3.90 is a 5% change (not worth the cost or hassle) my question is.... Is it better to go with the 4.11 which has 9 teeth on the pinion and 37 on the ring, or the 4.09 which has 11 teeth on the pinion and 45 teeth on the ring. Both are identical otherwise in terms of shaft diameter and splines obviously. Am I correct in assuming a 9-37 is a beefier and more robust arrangement? Would more teeth mean more or less Gear whine? Thoughts?