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Old 11-01-2013, 11:52 AM   #1
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Input on 3.73/4.10 gears on GT auto daily driver

Looking on input from guys with 2011-2014 GT autos with 3.73/4.10 gears that daily drive their cars (preferably in heavy traffic during the week and spirited driving on the weekend).

Do NOT want input from manuals, non GTs, older models, supercharged GTs, other gears.

Ill will never track/drag my car, so I don't care for converters, track times, what gear I cross the line in, what gears the fastest GT autos use.

My car: 2012 GT auto, AED tune, GT500 axle back, no resonators, 26.85" tall tire, lowering springs, shocks/struts, strut mounts, LCA+relo brackets, UCA+mount, adj PHB, 19" SVTPP wheels w/ MT street comps.......so traction with 4.10s might not be an issue.....idk you tell me.

Questions I have:
-did the butt dyno like the gear swap?
-anyone try 3.73 gears then jumped to 4.10s or vise versa?
-traction on either of these gears?
-how harmful are these evaluated highway rpms to engine life? (plan to keep my cars for many yrs.....but still want to have fun)
-don't care much for mpg but I have to ask.....how much did it drop?
-how are either of these gears in traffic?
-will the engine/exhaust be annoying at highways speeds (gt500 AB w/o resonators are quiet as they come)


And yes I used the search feature and all the threads on here went straight to the toilet. I am also aware of the handy rpm/mph charts AM has.
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Old 11-01-2013, 12:05 PM   #2
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All those questions with such a limited number if people you want to answer. Myself and many others on here could give a legitimate answer to your questions but I guess since I have a different model yet they use the same ratios I'm not qualified to answer. either way I recommend 4.10's. You'll like 3.73's but will want more soon.
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Old 11-01-2013, 02:25 PM   #3
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You're not going to get a good answer with the criteria you posted. But I have experience installing gears as well as two automatic vehicles that have had the rear ends built and geared. You're looking at higher rpms on the highway. Higher rpms equal less mileage, but your car will feel faster because its closer to the powerband. 3:73s in a 6sp coyote would probably be fun because the transmissions are geared low and that's why they come with 3:15s. A jump to 3:73s would probably make it "feel" like a monster on the line
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Old 11-01-2013, 02:35 PM   #4
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3.90...there may be TWO guys in here that fit under you criteria that have 4.10 or 3.73..they all stick to 3.31. Good luck
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Old 11-01-2013, 06:29 PM   #5
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3.90...there may be TWO guys in here that fit under you criteria that have 4.10 or 3.73..they all stick to 3.31. Good luck
It has to be better than the god awful 3:15's the auto come with.
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Old 11-01-2013, 07:00 PM   #6
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We got:

1 for 4.10

1 for 3.73.

1 for 3.31

And

1 for anything but 3.15

Lol.....guess it's one of those just try them all till you find the ones you like.
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Old 11-01-2013, 07:01 PM   #7
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Originally Posted by GTCS_2012 View Post
We got:

1 for 4.10

1 for 3.73.

1 for 3.31

And

1 for anything but 3.15

Lol.....guess it's one of those just try them all till you find the ones you like.
Lmao. ^
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Old 11-01-2013, 07:23 PM   #8
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Originally Posted by GTCS_2012 View Post
We got:

1 for 4.10

1 for 3.73.

1 for 3.31

And

1 for anything but 3.15

Lol.....guess it's one of those just try them all till you find the ones you like.
Well you probably didn't stress your demand on who can input enough since people outside of your demand answered you anyway.

So tell all them *****es that have 11-14 GT non supercharged auto biitches to answer and all them other biitches to back the fuk up and STFU or I guess you'll smack them the fuk up.

I don't have an auto so I'll STFU now your majesty. Good luck.
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Old 11-01-2013, 07:24 PM   #9
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Well you probably didn't stress your demand on who can input enough since people outside of your demand answered you anyway.

So tell all them *****es that have 11-14 GT non supercharged auto biitches to answer and all them other biitches to back the fuk up and STFU or I guess you'll smack them the fuk up.

I don't have an auto so I'll STFU now your majesty. Good luck.
^I have an auto however not a 5.0 but I once stayed at a Holiday Inn..Ba ha ha ha
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Old 11-01-2013, 07:30 PM   #10
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^I have an auto however not a 5.0 but I once stayed at a Holiday Inn..Ba ha ha ha
Damn baller!! Lol I stay at cheapy inns so I can spend my money on my stang bahahaha
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Old 11-01-2013, 07:33 PM   #11
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Do you plan to supercharge? I assume not..if you really want a steeper gear...go big or go home.
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Old 11-01-2013, 07:38 PM   #12
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Do you plan to supercharge? I assume not..if you really want a steeper gear...go big or go home.
^Then got to be 4:56 gears or go home
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Old 11-01-2013, 07:48 PM   #13
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^Then got to be 4:56 gears or go home
Not recommended...lol he said 373 or 410, 390 is right between sooo if he's still on the fence when it comes to purchase time, do the 390s ?
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Old 11-01-2013, 08:13 PM   #14
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Not recommended...lol he said 373 or 410, 390 is right between sooo if he's still on the fence when it comes to purchase time, do the 390s ?
Just kidding, you said go big or go home.
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Old 11-01-2013, 08:14 PM   #15
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Just kidding, you said go big or go home.
Yea I know maybe for a power glide it would be ok.
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Old 11-01-2013, 08:20 PM   #16
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Yea I know maybe for a power glide it would be ok.
That's right ^
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Old 11-02-2013, 05:31 AM   #17
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Traction will certainly will be an issue with 4.10's combined with your 4.17 for a 1st gear. I had traction issues with my 3.15's until I put a good 15" drag radial on. Why not ask Sean at AED on what he recommends?
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Old 11-02-2013, 09:14 AM   #18
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As long as your not planning FI. I recommend 3:55's but if MPG does not matter and you don't do much highway driving. Defiantly get the 4:10's
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Old 11-02-2013, 01:29 PM   #19
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Originally Posted by GTCS_2012 View Post
Looking on input from guys with 2011-2014 GT autos with 3.73/4.10 gears that daily drive their cars (preferably in heavy traffic during the week and spirited driving on the weekend).

Do NOT want input from manuals, non GTs, older models, supercharged GTs, other gears.

Ill will never track/drag my car, so I don't care for converters, track times, what gear I cross the line in, what gears the fastest GT autos use.

My car: 2012 GT auto, AED tune, GT500 axle back, no resonators, 26.85" tall tire, lowering springs, shocks/struts, strut mounts, LCA+relo brackets, UCA+mount, adj PHB, 19" SVTPP wheels w/ MT street comps.......so traction with 4.10s might not be an issue.....idk you tell me.

Questions I have:
-did the butt dyno like the gear swap?
-anyone try 3.73 gears then jumped to 4.10s or vise versa?
-traction on either of these gears?
-how harmful are these evaluated highway rpms to engine life? (plan to keep my cars for many yrs.....but still want to have fun)
-don't care much for mpg but I have to ask.....how much did it drop?
-how are either of these gears in traffic?
-will the engine/exhaust be annoying at highways speeds (gt500 AB w/o resonators are quiet as they come)


And yes I used the search feature and all the threads on here went straight to the toilet. I am also aware of the handy rpm/mph charts AM has.
GTCS_2012 - I'm in the same boat as you - I have a 2013 GT Auto and I'm a daily driver. I'm on the fence about which to get 3.73 or 4.1. I have been told to go with the 3.73, because my wheels will always be spinning with 4.1. I plan to get the 3.73 in early Dec.
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Old 11-02-2013, 04:31 PM   #20
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I got a buddy whos in the same situation....buts he opted to go 3.73 next month. So I'm gonna wait and drive his car, see if that makes up my mind.

Might be better to go 4.10 first to see if thats too much gear then you can just drop down to 3.73....instead of going 3.73 then feeling like theres more on the table, make the jump to 4.10 find out theres no traction there, and have to go back to 3.73.
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Old 11-02-2013, 04:43 PM   #21
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As long as your not planning FI. I recommend 3:55's but if MPG does not matter and you don't do much highway driving. Defiantly get the 4:10's
I may go FI, but years down the road. And I do 90% highway driving.....but idk if u can consider it highway driving because its LA traffic and its stop and go all the time.....even on saturdays now.....its lame.

I see the roush supercharge kits for around $6.5k i think......but i heard thats just to get your foot in the door, you have all these other components you have to upgrade or purchase......so whats a fair range to have in mind?
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Old 11-02-2013, 07:15 PM   #22
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Originally Posted by GTCS_2012 View Post

I may go FI, but years down the road. And I do 90% highway driving.....but idk if u can consider it highway driving because its LA traffic and its stop and go all the time.....even on saturdays now.....its lame.

I see the roush supercharge kits for around $6.5k i think......but i heard thats just to get your foot in the door, you have all these other components you have to upgrade or purchase......so whats a fair range to have in mind?
supercharger and install i'd say pushing about $7000 to $8000. Depending on options. With you living in Cali the Stage two and three are not emission legal out there. With a good dyno tune the stage one can be a decent setup. But IMO i think you should mod out your car where you are legal for emissions then add the NX wet 150 kit. I think you could see around 500rwhp maybe more with the right nos setup and dyno tune.
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Old 01-26-2014, 11:18 AM   #23
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Originally Posted by GTCS_2012 View Post
I got a buddy whos in the same situation....buts he opted to go 3.73 next month. So I'm gonna wait and drive his car, see if that makes up my mind.

Might be better to go 4.10 first to see if thats too much gear then you can just drop down to 3.73....instead of going 3.73 then feeling like theres more on the table, make the jump to 4.10 find out theres no traction there, and have to go back to 3.73.

Did you ever get new gears? I ended up getting 3.73 installed last week in my '13 auto and wow!!! What a difference! The RPM's climb so much quicker - I haven't had much time to experiment with them, but think it is exactly what I wanted. And my cruising RPM's didn't go up nearly as much as I expected. At 70 mph, I went from approx 1700 RPM's to 2000. I don't think it will effect my gas mileage all that much.
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Old 01-26-2014, 11:27 AM   #24
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No not yet, I needed up spending my money on wheels & tires, 15" brembo brakes, borla s-types, and a complete sound system. Need time to recover from that lol. But I think I will go 3.73.

Those lemans strips look sweet, did you install them yourself or have a shop do it?
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Old 01-26-2014, 11:56 AM   #25
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No not yet, I needed up spending my money on wheels & tires, 15" brembo brakes, borla s-types, and a complete sound system. Need time to recover from that lol. But I think I will go 3.73.

Those lemans strips look sweet, did you install them yourself or have a shop do it?

A new sound system was the first thing I did after purchasing my car - Then came the exhaust, followed by under the hood mods. I'm sure you'll be happy with the gears in your auto.

I had the strips professionally installed and they did a great job! I didn't want to do a half-*** job on them myself. :-p
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Old 06-06-2014, 12:23 AM   #26
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This is an old thread, but I actually have experience with gears on a a 2013 GT and 2014 V6....my father also worked as a Ford tech for 22 years so I can answer your question rationally rather than talk out my rear end.

Heres my findings:

The stock 3.31 gears in a mustang will suffice for most IF you get a torque tune from your fav vendor. I use bama. Its a cross between street and race. With only a tune, CAI, LCAs, Strut tower brace and bigger tires I posted a 0-60 under 4 secs, albeit by a millisecond. I use my car as a DD and am by no means a drag racer. Lets be realistic, how often do you really race on a track...2-5% of the time. Your mustang is most likely a DD in the real world, otherwise you would have bought a GT500 and plugged into the Matrix!

I upgraded my 2013 to 4.1 gears and could no longer use my torque tune for city driving, was WAY to jumpy. I had to downgrade to the performance tune. So now my down low 700-3000 RPM speed didnt change, but improved the top end a smudge. Pretty much a wash.

The coyote engine has 420 horsepower stock, with my tune and CAI it was at 450. So I had the torque without the aid of a tune, but also had WORSE gas mileage (1-2). Not much you say?...the 2013-14 GT gets 15 mph city on a good day, killing off 1-2 puts it in the mileage range of a sherman tank, so yes it DOES matter. I went back to my old gears in the end sadly.

Just remember, if you get a gear change you will NEVER be able to return your car to stock for service, the speedo will be off 30 mph and any half witted Ford tech (just a metaphor, the techs at Ford are pretty strong) will figure it out. If Im financing my car for 5 years and paid for an extended warantee, then it would make sense to upgrade the car with items that do not require a tune, but will only be enhanced by them. After the warranted period...what the hell S/C it!

V6 - WHOLE DIFF STORY. The V6 from the factory down low was downright pitiful, I mean... really Ford? (challengers are even worse!) Changed it to 3.73 Gears WITH a torque tune and was able to keep up with a stock GT down low at least. Well worth the money..period!

To sum up:

2013+ GT - just get a tune and forget the gears....unless you dont care about warantees, replace your tires often and can subsidize an extra 50-100 buck in gas a month (you are probably in the 18-25 yr age group). Anyone who says, "well, I'll just drive it slower on the freeway and keep my foot off it"....OK... yea, sure pal its a Mustang not a Prius.

The older GTs, have no actual experience so I wont comment or post opinionated nonsense.

V6 - do it and never look back!

Enjoy putting Dodge drivers in their place!
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Old 06-06-2014, 02:42 AM   #27
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This is an old thread, but I actually have experience with gears on a a 2013 GT and 2014 V6....my father also worked as a Ford tech for 22 years so I can answer your question rationally rather than talk out my rear end.

Heres my findings:

The stock 3.31 gears in a mustang will suffice for most IF you get a torque tune from your fav vendor. I use bama. Its a cross between street and race. With only a tune, CAI, LCAs, Strut tower brace and bigger tires I posted a 0-60 under 4 secs, albeit by a millisecond. I use my car as a DD and am by no means a drag racer. Lets be realistic, how often do you really race on a track...2-5% of the time. Your mustang is most likely a DD in the real world, otherwise you would have bought a GT500 and plugged into the Matrix!

I upgraded my 2013 to 4.1 gears and could no longer use my torque tune for city driving, was WAY to jumpy. I had to downgrade to the performance tune. So now my down low 700-3000 RPM speed didnt change, but improved the top end a smudge. Pretty much a wash.

The coyote engine has 420 horsepower stock, with my tune and CAI it was at 450. So I had the torque without the aid of a tune, but also had WORSE gas mileage (1-2). Not much you say?...the 2013-14 GT gets 15 mph city on a good day, killing off 1-2 puts it in the mileage range of a sherman tank, so yes it DOES matter. I went back to my old gears in the end sadly.

Just remember, if you get a gear change you will NEVER be able to return your car to stock for service, the speedo will be off 30 mph and any half witted Ford tech (just a metaphor, the techs at Ford are pretty strong) will figure it out. If Im financing my car for 5 years and paid for an extended warantee, then it would make sense to upgrade the car with items that do not require a tune, but will only be enhanced by them. After the warranted period...what the hell S/C it!

V6 - WHOLE DIFF STORY. The V6 from the factory down low was downright pitiful, I mean... really Ford? (challengers are even worse!) Changed it to 3.73 Gears WITH a torque tune and was able to keep up with a stock GT down low at least. Well worth the money..period!

To sum up:

2013+ GT - just get a tune and forget the gears....unless you dont care about warantees, replace your tires often and can subsidize an extra 50-100 buck in gas a month (you are probably in the 18-25 yr age group). Anyone who says, "well, I'll just drive it slower on the freeway and keep my foot off it"....OK... yea, sure pal its a Mustang not a Prius.

The older GTs, have no actual experience so I wont comment or post opinionated nonsense.

V6 - do it and never look back!
OP asked about changing to 3:73/4:10 in an automatic car. The auto's have stock 3:15 gearing and not 3:31. So from reading your post you say in the 13'+ do not change gears. I think going from the auto 3:15 to the 3:31 found in the MT would be the way to go in an auto DD. He will gain a little acceleration while not losing much in MPG.

Enjoy putting Dodge drivers in their place!
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Old 06-06-2014, 02:47 AM   #28
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How did the ME server mess up my reply? It added my reply in WileECoyoteGT's quote.
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Old 06-06-2014, 12:47 PM   #29
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Uh, no you do not want that high of a gear in an A6. 1st gear in an A6 Coyote is 4.17, coupled with 3.73s or 4.10s and that much power is going to turn your launches into a spinfest.

Also have fun whirring down the highway with the .69 overdrive and 4.10s in that thing...
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Old 06-06-2014, 03:14 PM   #30
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You are absolutely right on the base auto using 3.15, realized I had typo'd that afterwards....was replying to a post in another forum and had 3.31 on the brain. Nothing like boosting your own credentials then posting erroneous info, wow I feel like an idiot ;o)

I have some satisfying tire spin with my torque tune and a little chirp in 3rd as well. My question is, is going from 3.15 to say 3.55 a good compromise given my 5.0 configuration? I dont want my car to turn into a burn-fest since I already bought better performance Nitto tires!

I learned a bit abour gear ratio and torque output from dear ol dad. What guys seem to get hung up on is the number "3.15". Its too low you'd think. For a 2012 or older GT, yes/maybe it is....2013-2014 different animal, different engineering. I got lost in the formula calculations he was spouting out, but my GT puts out the equivalent of a much higher gear ratio in 1st and 2nd gear...mathematics of it all I guess. Given that, 4.1 gears would have been near undrivable in a 2013 with a race/torque tune.

Given all that, I feel an aggressively tuned car outperforms a car with gears and a lesser tune, not to mention I get better MPG and can still return my beast to TRUE stock for service.

GTCS_2012 - if you are determined to gear up, go with 3.73
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Old 06-06-2014, 05:57 PM   #31
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I've been 11.4 @ 121 mph with my 3.15's. I would not be any faster with more gear, this I'm sure.
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Old 06-06-2014, 06:04 PM   #32
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I've been 11.4 @ 121 mph with my 3.15's. I would not be any faster with more gear, this I'm sure.
Nice! No doubt about that.

I recently hit a millisecond below 4 sec 0-60 with the stock gears, so was swayed to hang onto what I have already.

Unrelated:
I know most guys in these forums bash the throttle body spacers, but I bought this "coaster" anyways today..we'll see. Speed is addicting and Im in a 12 step program.
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Old 06-06-2014, 07:58 PM   #33
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Bama can tune rev miles to what ever gear you want. I can find them listed on sights for older Mustangs.
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Old 06-06-2014, 08:21 PM   #34
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There are way better tuners than Bama for the Coyote.
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Old 06-06-2014, 10:37 PM   #35
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Originally Posted by scottydsntknow View Post
There are way better tuners than Bama for the Coyote.
Absolutely.
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