What gears?
 

Which gears should i go with 3.73's 90's or 4:10's on a stock car? which would give me a performance bonus?

4.30s

4:30's?

for a stock non pi car... 4.30s

I wish I would have went 4.30s

4.30's seem kinda steep. You will be looking at high RPM's at 70MPH. I would say 3.73's, I have 3.55's in mine and it's plenty quick.

LOL at 3.55s.. for a non PI mustang you need every advantage you can get.

if your that paranoid about gas dont drive 70. drive 65 and youll save some.

lol at 3.55's. I love my 4.10's. i get on the highway maybe once a week so thats why i went 4.10, if i did all rural driving i woulda got 4.30. and so far i have beat all my friends with 3.73's and more bolt ons than i have

3.73s if its a DD 4.10s or 4.30s like hoss and boduke said if not theyll disagree with me but its just my opinion :D

I have 4.10s on my car and drove it 80 miles to work and back. Don't let this affect your decision. What I found on my car is that with 4.10s and a 5 speed you did not need to down shift into 4th gear like stock gearing to pass quickly and found with my driving habits I got the same gas mileage with 4.10s and 3.27s. FYI I was have my foot in it and averaged 17-18 mpg prior to blower.

What are your future plans for your car? And do you go to the track? Will you be going FI someday? If so, will it be a centri or a KB? If KB then you should go with 3.55s or 3.73s. Centri I recommend 4.10s.

Well my plan for this car is to do the pi swap soon within the next year, and im going to supercharger it probably with in the next year to and i havnt taken it to the track cause my rear end is F#cked up but once i get that fixed i will be at the track almost every weekend. So 4:10's would suit me fine for both as your saying?