Thanks! I stuck with the FD diff as I had already installed the KAAZ 1.5 way, so I bought a set of 3.90's to help out. I'm hoping it will hold up, I'm thinking between the Samburg diff mount and 300M axle bars, I "should" be good (not running slicks ever). I intend on occasionally running the 1/4 (on street tires, as I only care what it can do from a daily standpoint). The car was more intended for the occasional track-day/ weekend cruiser. I have only put 1K miles on the setup before the dreaded snowfall in central NY, I do want to re-check my drive-line angles (notice the increasing drive-train noise around 155 mph+), I'm assuming that is the culprit, though I know the diff mount will send resonation through the body of the car- anybody who has experienced a similar situation, please chime in!