[black281]

Blue, I'm not Mustang92 but I can give you some input to your questions. The T/A on my car is set at 14 degrees. I run 92 octane with no pinging issues whatsoever. I definetly felt a real noticeable gain in low end torque with the T/A set at 14. Most guys seem to use about 14 to 15 degrees. So I see your thinking about 4.10's. From what I hear thats a awesome mod, really helps with acceleration. I got 4.10's sitting in my room and I am looking to install them soon. I've been calling around to get a good deal. One quote I got was $500 for labor (yeah right). Another place I called was only $300 for labor so that's where I'm probably going. As far as recalibrating the speedometer after the gear install, you could call Dallas Mustang they have a device that goes for about $100 and allows you to calibrate the speedometer by tapping into some wires and setting a few dip switches. Hope this helps for now.