Hi- newby to the site but am on my 3rd Stang- I have a mostly stock 95 GT and a 98 Supercharged Cobra. I have had quite a few different gears trying to answer the same question. If you are going to supercharge and leave the stock tranny in place, 3:73 are just right IMO if you are daily driving and are looking for good balance. I have had 4:10's and 1st is pointless (IMO) with 444 horses at the wheels, spins into third. 4:10's with a T56 works out to similar ratios as the 3:73/stock tranny combo that is what I have in my Ram SRT-10. If you are building a strip car with the stock tranny, absolutely don't fear the gear. In a recent MM&FF article a Supercharged '98 Cobra (Vortech, 12 PSI @ 500 HP, racing slicks) broke into the 10's with a stock motor and 4.30's. If you are definitely going to supercharge, do the gear 2nd that way you can better estimate how much gear you want for your driving habits. There are also some sites that have calculators to help you do the math. No supercharger? 3:73's are a nice jump, but 4:10's are great to get it into the powerband QUICK. Good luck!