So i found something interesting today. While i was bored waiting for some people i started taking apart my dash. To my discovery i found a Dallas Mustang SpeedCal all hooked up under, and i never noticed it before. Ive owned the car for a few months now, and after looking up the code for the panel on the inside of the speedcal i learned my car has 3.73 gears installed. Now for Xmas my mom got me 410's. My question to you guys is although it may not be till winter or next summer when i go with a blower. Do you guys think i should swap in my 4.10's or sell the 4.10s and leave in the 3.73's??