how much will 3.73s hurt my gas milage
From what? 3.31? That mod reduced my Highway MPG by about 8 to 10 Percent. In town its up to me. If choose gears which result in the lowest RPM, then I can get about 3 percent better mpg. But if I get aggressive, its 13% worse. The latter is hard to avoid. Hopping on the highway is more fun.
If you talking about the 2011 GT with its 6 speed. Were it me, I think I would opt for the 3.55s. Because of the lower 1st and Higher 6th, 1st will be like the 5 speed with 3.73s. And 6th would be like the 5 speed with 3.31s. Seems about right to me from how I drive my car. Spirited but not racing.
5spd or six speed doesnt matter. what matters is the final drive ratio of the tranny which would be close to each other. i went from 355s to 410s and my rpms went up only 300 at 70mps in overdrive. or 5th gear which ever you prefer to call it. biggest thing to think about is if you are worried about gas mileage then you probably shouldnt be modifying the car anyways
......, what year is your mustang? I have an 06 GT 5sp auto, and I have been thinking of going with the 410s,?
If you talking about the 2011 GT with its 6 speed. Were it me, I think I would opt for the 3.55s. Because of the lower 1st and Higher 6th, 1st will be like the 5 speed with 3.73s. And 6th would be like the 5 speed with 3.31s. Seems about right to me from how I drive my car. Spirited but not racing.
Hey thanks for those #'s Big Large, good to know...looks like ViperNuge has exacty the #'s I'm looking for, being that his car is auto with 410s.mustanglvr my stang is an 05 with the the manual. im turning 2550rpm at 70 in 5th with the 410s and 2750rpm at 75mph. im loving my 410s but my car is a fun car for the most part. only put 2300 miles on it since i bought it in november. 1st goes by quick, 2nd feels almost like stock 1st gear and 3rd and 4th pull like a beast. my car is stock other than mufflers and the gears. im ordering my cai and tuner from americanmuscle tomorrow so im pretty pumped about that
We have the same car dude. Get a brenspeed/cai tune combo first or when you order your 4.10 gears. The car is so much better with 4.10s. My car ran a 13.9 stock. With gears, tune/cai it ran a 13.4. Huge difference in how it drives and responds to the gas pedal. Dont be afraid to mod your stang!!!
patrick