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4.10's with the Auto, I believe that your car comes factory with 3.55's? You won't notice much of a difference from that to 3.73's. You won't notice a difference in fuel economy drop between 3.73's and 4.10's either. It will have about the same effect on fuel economy.
how do i find out exactly what gears i have? i was sure i had 331
I had a tag on my pumpkin that said 3.55. There are other ways to tell, like jacking up the car and turning the tires and counting the rotation of the drive shaft.
If it were a 2V I wouldn't say this but I would probably go with a CAI and tuner from AM. 3v's respond so well to bolt on's that it's sickening. After that, I would probably go with some gears (410's) and maybe a TB and plenum combo, then suspension. GL!
IMO gears arnt really needed unless your really doing some drag racing. nut that is just me. lots of guys love them.. I had one exactly like this.. black too!!. i loved it. i just got a 13 gt. let me know if your interested in ford racing CAI and SCT tuner. i still have it.