I know of at least three members here and on the FE Engine Forum that are using 3.50 gears with the .64 OD and seem to be happy with them. I'll be running my 3.82 gears for a while, then after that I want to try a set of 3.50's. I really want that first hand experience with the different ratios in my car, my driving habits, my routes etc. I don't want any conclusions just yet but from what I"m seeing so far it looks like a 3.25 gear and .82 OD might be my daily driver setup.