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4:10 vs 3:73 vs 3:55 vs 3:27 gears

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Old 05-31-2012, 08:36 AM   #1
Dudewright0715
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Default 4:10 vs 3:73 vs 3:55 vs 3:27 gears

So I just bought a new bullit and the guy before me had 4:10s on it..I can honestly say I hate them....call me crazy but don't like them at all..when on the highway which I do alot of highway driving ...

At 75mph my Rpms are at 3k! I'm getting like 17 mpg on highway...so with that being said which one of these will give me the best mpg for highway driving?? 3:27? = stock?

Thanks guys!
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Old 05-31-2012, 08:54 AM   #2
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buy a honda if you want mpg's.

otherwise 3.27's
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Old 05-31-2012, 08:57 AM   #3
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Get 2.80s
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Old 05-31-2012, 09:05 AM   #4
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:facepalm:

swap to 2.73s and never shift again!
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Old 05-31-2012, 09:09 AM   #5
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Sell the bullitt. Buy a smart car.
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Old 05-31-2012, 09:12 AM   #6
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Quote:
Originally Posted by Dudewright0715 View Post
So I just bought a new bullit and the guy before me had 4:10s on it..I can honestly say I hate them....call me crazy but don't like them at all..when on the highway which I do alot of highway driving ...

At 75mph my Rpms are at 3k! I'm getting like 17 mpg on highway...so with that being said which one of these will give me the best mpg for highway driving?? 3:27? = stock?

Thanks guys!
Go with 3.27s or 3.55s to bring th highway rpms down and your highway mileage up. It want be as quick off the line after the gear change but obviously thats not your concern so either go with 3.27s or 3.55s.
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Old 05-31-2012, 09:18 AM   #7
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Go with 3.27s or 3.55s to bring th highway rpms down and your highway mileage up. It want be as quick off the line after the gear change but obviously thats not your concern so either go with 3.27s or 3.55s.
Thank you so much sir. I civilized and respectful answer ..unlike that one smart a$$ about the honda and that one douche bag about the smart car. Ya know I really aprriciate alot of you on here such as mr rockwell28. But some of you really should grow the f&c$ up and answer something in a adult manner. And not be a A$$hole. Grow up children just because you drive a v8 mustang and your 16 doesn't make you a bada$$. Thanks again mr rockwell28.

You should all take lessons for him
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Old 05-31-2012, 09:19 AM   #8
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Get 2.80s
Thanks man I'll look into it
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Old 05-31-2012, 09:55 AM   #9
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Thank you so much sir. I civilized and respectful answer ..unlike that one smart a$$ about the honda and that one douche bag about the smart car. Ya know I really aprriciate alot of you on here such as mr rockwell28. But some of you really should grow the f&c$ up and answer something in a adult manner. And not be a A$$hole. Grow up children just because you drive a v8 mustang and your 16 doesn't make you a bada$$. Thanks again mr rockwell28.

You should all take lessons for him
No problem and good luck with that ride!
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Old 05-31-2012, 10:30 AM   #10
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I had 4.10s in my GT and got 24mpg driving like a normal person.

Either you need to change the way you drive, sell your car and buy a corolla, or be happy with 17mpg. My Jeep is getting me 17mpg and I'm ecstatic
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Old 05-31-2012, 10:55 AM   #11
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going from stock gears up to 3.73s my highway mileage went from 26-27mpg hwy(3.27s) down to 23-25 mpg hwy(3.73s) so we know that when you change out tthe rear gear from factory that on the highway you will be spinning at higher rpms and your highway mileage will go down quite a bit and every car is different. I dont daily drive my mustang so mileage isnt a huge concern to me but if I were getting 17mpg hwy then I would want to make some changes myself gas isnt .89 a gal like it was when I first started driving in the 90s. And op while you're at it you may as well make sure the air filter is good to go just recharge it if its an oilable filter and also change out the fuel filter they run like $14 and its a 15-25min job every bit helps.
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Old 05-31-2012, 10:58 AM   #12
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I would say 3.55 is going to be your sweet spot. I have the stock gears in mine witch I bileve is the 3.27 and I'd like a steeper gear even with all the mods. I wouldn't go back to stock because your still going to want that stuck back in your seat feeling when you dart it
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Old 05-31-2012, 11:06 AM   #13
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Originally Posted by tdcalhoun89 View Post
I had 4.10s in my GT and got 24mpg driving like a normal person.

Either you need to change the way you drive, sell your car and buy a corolla, or be happy with 17mpg. My Jeep is getting me 17mpg and I'm ecstatic
Did you read my earlier post???

And 70 mph is a fast driver huh? Hell according to you it is...when I do 70 my Rpms are at 2900 so...I guess I'll need to drive like you 45 on the highway. I never race. Never abuse it. I work to hard for my money
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Old 05-31-2012, 11:10 AM   #14
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Originally Posted by Rockwell28 View Post
going from stock gears up to 3.73s my highway mileage went from 26-27mpg hwy(3.27s) down to 23-25 mpg hwy(3.73s) so we know that when you change out tthe rear gear from factory that on the highway you will be spinning at higher rpms and your highway mileage will go down quite a bit and every car is different. I dont daily drive my mustang so mileage isnt a huge concern to me but if I were getting 17mpg hwy then I would want to make some changes myself gas isnt .89 a gal like it was when I first started driving in the 90s. And op while you're at it you may as well make sure the air filter is good to go just recharge it if its an oilable filter and also change out the fuel filter they run like $14 and its a 15-25min job every bit helps.
Very good! That's what I was going to do today but it's porring:/ I was gonna do everything change oil flush the radioator fuel filter everything..lol and yep I remember those times back when gas was cheap..I remember when it when up to 50 cents a gallon I was mad lol I had a 66 back then.

Thanks again sir you've been very helpful
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Old 05-31-2012, 11:11 AM   #15
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Originally Posted by russellthelovemuscle View Post
I would say 3.55 is going to be your sweet spot. I have the stock gears in mine witch I bileve is the 3.27 and I'd like a steeper gear even with all the mods. I wouldn't go back to stock because your still going to want that stuck back in your seat feeling when you dart it
Gottcha that is true I'll see what the shop has on sale cause sometimes they have good stuff for like 30% off. I will keep in mind. Thanks my friend
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Old 05-31-2012, 11:38 AM   #16
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Click the image to open in full size.

just buy a smart car or if your feeling sporty get a Honda Del Sol if you want good mpg's
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Old 05-31-2012, 11:40 AM   #17
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Alright let's think with some logic here if you are going to change the gears for gas mileage you are wasting money. With 3.27s you may gain 2 mpg that will take for ever to pay back the 5-700 dollars that it will take to have the gears swapped and diff rebuilt and put new seals in it. Now if you want good gas mileage you never should have bought a mustang should have got a civic or prius, now on your comments were you went off on everyone that told you facts and you didn't like to hear it grow the f up and accept the fact everything that was said to you is true and if you don't like it you can get the f off the internet and go cry to your mommy
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Old 05-31-2012, 12:13 PM   #18
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Dude it's a F'n forum roll with the sarcasim it make life a lot easier. Firing back and calling people ahole's and telling them to grow up makes you look like a dousche. anyway
Like stated about you have to factor in the payback for the gear swap to make this worth while. If I where to think the way you do I would put in 3.55's
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Old 05-31-2012, 12:27 PM   #19
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so explain to me how i got 26mpg on the highway with 4.10's ( at 65-75 mph) multiple times..just keep your foot out of it and you'll be good.

Dont get so butthurt about the sarcasm lol damn
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Old 05-31-2012, 12:32 PM   #20
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Originally Posted by 99 GT vert View Post
Alright let's think with some logic here if you are going to change the gears for gas mileage you are wasting money. With 3.27s you may gain 2 mpg that will take for ever to pay back the 5-700 dollars that it will take to have the gears swapped and diff rebuilt and put new seals in it. Now if you want good gas mileage you never should have bought a mustang should have got a civic or prius, now on your comments were you went off on everyone that told you facts and you didn't like to hear it grow the f up and accept the fact everything that was said to you is true and if you don't like it you can get the f off the internet and go cry to your mommy
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Dude it's a F'n forum roll with the sarcasim it make life a lot easier. Firing back and calling people ahole's and telling them to grow up makes you look like a dousche. anyway
Like stated about you have to factor in the payback for the gear swap to make this worth while. If I where to think the way you do I would put in 3.55's
on that same note one has to factor in the amount of money to be lost monthly while getting 17mpg hwy 17hwy x a 15.7 gal tank =266 miles a tank now with a gear swap that will cost lets say he gets to 26mpg hwy 26mpg hwy x a 15.7 gal tank=408 miles a tank thats an possible extra 142 miles a tank added bc of a gear swap when he didnt put those 4.10s in himself in the first place so its a modification that varies from person to person on which gear to go with that he(op) didnt even opt to put in.

But anyway it will cost to buy the gears and have them installed but the possible extra 142 miles per tank after the gear change will kinda pay for itself monthly and over time. Maybe im wrong on that. And we are all grown *** men and women here but whenever a gear thread or mileage is brought up things always seem to take a negative turn we all have options and if its possible to get 20++mpg out of a car for someone whom actually cares about doing so then why talk **** to that person? Different strokes and different goals with the cars. How about we drive on and respect eachohters choices no matter if we agree with them or not even though that can be easier said than done.
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Old 05-31-2012, 12:32 PM
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