Ok, I have gotten a lot of good info on here from you guys . I think that I am going to go with a set of gears and have the shop tune for my gears with the Xcal so I will just do both at the same time. Instead of having to tune it twice (saves time and $$$ obviously). Now since I am limited on funds I think I will have to sit on my 500 that I have and wait till next month and I can get say another 4-500 and just do them then. Man that’s going to be hard, but will be well worth it. My question to you guys is; should I do 4.10’s or 3.73’s? From most of the threads I have read I know you all say 4.10, but why? Is there really that big of a difference from 3.73 to 4.10? Also I do a good amount of freeway driving and I don’t know if I would want to be having high RPM’s while doing 70-80 mph. And when you’re in first gear with a set of 4.10’s vs. 3.73’s do you have to shift really quick? I saw the video that was a sticky and it seemed like he was in 1st for barley a second then had to shift to 2nd quickly. I guess I am just trying to achieve a good balance of a fast stang with a daily driver that will last. Last question, I am still thinking about doing a NOS setup like a 75 shot . Do you think that it would be too much to have a 75 shot with a set of gears? And if so should I just wait and have the shop dyno tune it all at once?