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Old 07-07-2014, 03:07 AM   #1
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3:73 or 4:10

I just got a 2013 GT auto. I would like to put new gears into it but I'm having trouble to decide which gears, i am leaning towards the 4:10 gears but would like some feed back on what others think.
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Old 07-07-2014, 04:47 AM   #2
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3:73's for a Stick & 4:10's for an Auto is the Rule of Thumb.
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Old 07-07-2014, 04:50 AM   #3
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I thought the 2013's came with 3:55's ? If so I'm not so sure you'll see a big difference with a gear change.
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Old 07-07-2014, 05:05 AM   #4
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I just got a 2013 GT auto. I would like to put new gears into it but I'm having trouble to decide which gears, i am leaning towards the 4:10 gears but would like some feed back on what others think.
Neither. Your car will be no faster with either one.
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3:73's for a Stick & 4:10's for an Auto is the Rule of Thumb.
Horrible advice. I'm guessing you have zero experience here and probably don't even own one of these cars?
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I thought the 2013's came with 3:55's ? If so I'm not so sure you'll see a big difference with a gear change.
They come with 3.15's.
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Old 07-07-2014, 06:05 AM   #5
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We should just rename this forum "3.73 or 4.10s?"
Someone makes a thread about this like twice a day
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Old 07-07-2014, 07:28 AM   #6
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I drive a stick so i didnt read much into the article, but over on SVTP there was a thread where a tuner did some testing with an auto and changing gears past a 3.31 really made no difference on the stock converter.

I think people are still assuming these are the anemic mustang engines of the past that need a steep gear to be fast... this engine has a broad powerband, put a good gear in there and let it eat.
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Old 07-07-2014, 08:37 AM   #7
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I just got a 2013 GT auto. I would like to put new gears into it but I'm having trouble to decide which gears, i am leaning towards the 4:10 gears but would like some feed back on what others think.
Good question (Loving your screenname by the way) and I'd have to ask if this is a daily driver and what your commutes like per day? Some people swear up and down on one, and some the other. I've had both so I like to play the devils advocate here. Let me know so we can get a better idea of how to help! Sidenote, are you planning on dragging in he the future? Plans for other mods?

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Old 07-07-2014, 08:44 AM   #8
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We should just rename this forum "3.73 or 4.10s?"
Someone makes a thread about this like twice a day
Agreed.
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I drive a stick so i didnt read much into the article, but over on SVTP there was a thread where a tuner did some testing with an auto and changing gears past a 3.31 really made no difference on the stock converter.

I think people are still assuming these are the anemic mustang engines of the past that need a steep gear to be fast... this engine has a broad powerband, put a good gear in there and let it eat.
Excellent point. Mike Rousch is the tuner you're referring to. His testing was actually on the same day with multiple passes in each gear. The 3.15's were faster.
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Old 07-07-2014, 08:51 AM   #9
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Old 07-07-2014, 12:22 PM   #10
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Old 07-07-2014, 12:57 PM   #11
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That "rule of thumb" for 3.73 with stick and 4.10 for auto was only for the SN95 models. Even then it wasn't that great of a rule of thumb.


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Old 07-07-2014, 03:06 PM   #12
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I'm guessing that's where I got that info from as I'm usually on the SN95 Forum as that is what I drive. And no Grabber...I don't have a 2013 & had no idea that it wouldn't make a difference to do a gear change. Thanks for another lesson learned. Hey...gotta learn somehow & I was just going by what I was told by a Staff Member on the SN95 Forum....which the info was correct for the SN95's. I thought that info applied to all Sticks or Standards. I stand corrected.
Thanks for the info.
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Old 07-07-2014, 03:50 PM   #13
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I'm guessing that's where I got that info from as I'm usually on the SN95 Forum as that is what I drive. And no Grabber...I don't have a 2013 & had no idea that it wouldn't make a difference to do a gear change. Thanks for another lesson learned. Hey...gotta learn somehow & I was just going by what I was told by a Staff Member on the SN95 Forum....which the info was correct for the SN95's. I thought that info applied to all Sticks or Standards. I stand corrected.
Thanks for the info.
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Old 07-07-2014, 04:43 PM   #14
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Neither. Your car will be no faster with either one.
Scratching my head here. Are you saying that there is no difference between 3.15s and 4.10s?

I swapped to 4.10s in my 2013 and they made quite the difference.
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Old 07-07-2014, 04:51 PM   #15
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Scratching my head here. Are you saying that there is no difference between 3.15s and 4.10s?

I swapped to 4.10s in my 2013 and they made quite the difference.

The car has the power to go through the gears, just needs a stall converter. No need to shorten the gears.


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Old 07-07-2014, 05:00 PM   #16
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Scratching my head here. Are you saying that there is no difference between 3.15s and 4.10s?

I swapped to 4.10s in my 2013 and they made quite the difference.


on the butt dyno, or at the track? Just because it is going through the gears quicker, does not mean it "is" quicker. Obviously there's some subjective variables to that statement, but at least to me it makes sense.


if you have a longer gear (lets say 3.31 for the sake of argument) and have the power to pull through it, you will be faster because you're spending more time in the meat of your power band.


Now, the flip side (4.10, again, for the sake of example) is a gear to "get you into the powerband," quicker. Well, yes, you're getting into the power quicker but you're also not spending as much time in it. instead of power-power-power-power - shift - power - power - power... its power-power - shift- power - power - shift... basically you're just running through the gears at that point and not utilizing the power you have.


Now, here's another place it gets subjective; what are you doing with the car? I had a bama tune, Air raid intake, Lethal catless H pipe 3.31 M6 and raced a long tube / boss intake auto with 4.10s. From a freeway roll I stomped him so bad it wasn't even funny, from dig / low rolls he left me so bad it looked like I was standing still. I have been to the track, and yes, my 3.31's are not ideal, but I really don't go to the track hardcore.


So, to summarize the above^, the steeper gears really only matter in 1st gear, at the track, but on the street it doesn't matter. With my 3.31's and cobrajet intake I can damn near do a 60 roll in 2nd lol, I'm never "out" of my powerband, so I don't need to use gear as a crutch to get there.
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Old 07-07-2014, 05:00 PM   #17
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Scratching my head here. Are you saying that there is no difference between 3.15s and 4.10s?

I swapped to 4.10s in my 2013 and they made quite the difference.
Based on what? Show me the data, time slips for proof.
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Old 07-07-2014, 05:05 PM   #18
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Feeling faster is different than being faster.


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Old 07-07-2014, 05:09 PM   #19
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Scratching my head here. Are you saying that there is no difference between 3.15s and 4.10s?

I swapped to 4.10s in my 2013 and they made quite the difference.
Wait a second, didn't admit here you regretted going with 4.10's because they were to much?
3.73s or 4.10s
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Old 07-07-2014, 06:07 PM   #20
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Good question (Loving your screenname by the way) and I'd have to ask if this is a daily driver and what your commutes like per day? Some people swear up and down on one, and some the other. I've had both so I like to play the devils advocate here. Let me know so we can get a better idea of how to help! Sidenote, are you planning on dragging in he the future? Plans for other mods?

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Old 07-07-2014, 06:10 PM   #21
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I honestly do not know much about cars at all. I'm just looking for help on what good mods to put on my car that will give me the biggest gains and power and tq but not break my piggy bank right away.
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Old 07-07-2014, 06:19 PM   #22
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If only there was like, a car forum, where you could search for information you needed. Man, that would be awesome... Oh well
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Old 07-07-2014, 06:22 PM   #23
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If only there was like, a car forum, where you could search for information you needed. Man, that would be awesome... Oh well

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I honestly do not know much about cars at all. I'm just looking for help on what good mods to put on my car that will give me the biggest gains and power and tq but not break my piggy bank right away.
A good tune and a converter are the two best mods you can do power wise for an auto outside of F/I.
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Old 07-07-2014, 06:29 PM   #24
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I think all you haters can get smoked on by my 99 kb mustang lol
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Old 07-08-2014, 08:26 AM   #25
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Yes this is a Dailey driver car and yeah I plan on dragging. Yes I also plan to
Put other mods on it!
If this is your daily then I would think about what type of mileage you're putting on her weekly. I ran 4.10's and drove like a grandma as was able to avoid filling it every 7 days but it's dependent on how much you're dipping into the throttle.

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I honestly do not know much about cars at all. I'm just looking for help on what good mods to put on my car that will give me the biggest gains and power and tq but not break my piggy bank right away.
AM isn't commission based but we definitely have a fair amount of recommendations! It's going to depend on what you're trying to spend. This forum as well as many others is filled with pretty solid information as well, so don't hesitate to let us know if you have any questions. In the meantime take a look at some of our Best Selling Parts and let me know if you have any questions!

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