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Old 01-15-2014, 11:03 PM   #1
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Gears

Looking to get new gears for my 2012 v6 mustang. I have an automatic transmission. Now the real question .. 3.73 or 4.10s ??
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Old 01-15-2014, 11:11 PM   #2
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Looking to get new gears for my 2012 v6 mustang. I have an automatic transmission. Now the real question .. 3.73 or 4.10s ??

4.10!

BUT


apparently you also need a tuner... so... put that in the budget as well lol.
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Old 01-15-2014, 11:11 PM   #3
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Haha I have a tuner already !
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Old 01-15-2014, 11:13 PM   #4
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Haha I have a tuner already !
then 4.10s!
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Old 01-16-2014, 02:22 AM   #5
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4.10s. don't even question it.
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Old 01-16-2014, 02:41 AM   #6
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4.10s and I would look at getting a one piece driveshaft as well. While the incidents where the stock two piece fails are isolated, it's my understanding that the 4.10s are gonna put some extra stress on your driveshaft due to the changes in rpm-speed ratio. I plan on swapping gears in the spring and a one piece driveshaft is going in at the same time

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Old 01-16-2014, 03:31 AM   #7
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Looking to get new gears for my 2012 v6 mustang. I have an automatic transmission. Now the real question .. 3.73 or 4.10s ??
In an auto go 410s and deoending how u drive u can still get almost 19mpg

I have 373s and get 23mpg mainly highway and 19 city.

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Old 01-16-2014, 09:03 AM   #8
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See everyone keeps telling me 373 when all I want is 410 but it is my DD does that change your answer?? I bought mine from and old mechanic, it was his 70 year old wifes toy lol and hi granddaughter drove it so he dropped it to 273!!! It's killin me and I need to decided soon too.
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Old 01-16-2014, 11:06 AM   #9
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Na 410s are fun n if u dont get on it u get decent mpg

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Old 01-16-2014, 11:21 AM   #10
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Looking to get new gears for my 2012 v6 mustang. I have an automatic transmission. Now the real question .. 3.73 or 4.10s ??
I have 3:73 gears in my 2011 automatic and absolutely love them. With that said you could easily go with 4:10 gears all day long and with our 6 speed automatics it would be the cats meow. I do think 3:73 gears are the perfect blend for city and highway driving along with 1/4 mile track use but 4:10's would also rock out.
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Old 01-16-2014, 03:00 PM   #11
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I have 4.10 in my auto. I still get around 26 mpg going 70 mph and better mpg in the city with the gears. I don't drive much highway though. I reeally like the way they transformed the car. 1st and 2nd gear have way more balls then before. The car hauls out, when I can get traction.



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Old 01-16-2014, 10:48 PM   #12
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I have 4.10 in my auto. I still get around 26 mpg going 70 mph and better mpg in the city with the gears. I don't drive much highway though. I reeally like the way they transformed the car. 1st and 2nd gear have way more balls then before. The car hauls out, when I can get traction.



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Holy sh*t you get 26mpg with 410s? My buddy only get 21 max and I get 23 with 373s

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Old 01-17-2014, 01:23 PM   #13
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that's not unheard of. my 3.7 gets 24-25 with 4.10s as well. I beat on mine quite a bit ever since I went FI
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Old 01-17-2014, 01:55 PM   #14
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3.73 with a 26" tire would get you the 4.10 . Swap tires back to your 27.6" stockers for the highway, best of both worlds. The aluminum shaft will help mileage a bunch at highway speeds. #1 Get the tuner.
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Old 01-17-2014, 02:06 PM   #15
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Do you plan on adding boost in the future?
If so, 4.10s are a terrible idea.
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Old 01-17-2014, 02:19 PM   #16
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If you plan on putting a turbo on the car then 4.10s might not be the optimal gear, especially with a stick. With an automatic 4.10 are equal to 3.73 in the Mt82. I run 4.10 with a 26.5 inch tire. The car drives so much better. Getting on it in 1st over half throttle gets it sideways, and the shift into second has the whole car squirming around furiously. I think most people who say "don't get 4.10 it's to much gear" have never actually driven a car with 4.10. The difference in rpm in 6th gear is about 400 rpm and that's with my very short tires compared to stock 3.31 gearing with 28 inch tires. That's not much st all, but the performance in gear 1-4 are much improved.



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Old 01-17-2014, 02:21 PM   #17
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So with 4.10 you can feel a diff compared to stock ?
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Old 01-17-2014, 02:24 PM   #18
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Yea I have done a 180 mile round trip to my girlfriends house many times, with 3.31 and 4.10. I use the same amount of fuel : half a tank round trip. The highway mpg has dropped off, and if I go over 70 it starts dropping hard, but, if I keep it @70 mph @ 2500 RPM it can easily see 26 mpg. To Me, not much of a difference in overall mpg. I do get there a little slower, but it's fine for the added performance. If anything the 4.10 increase my overall mpg but I drive all city other than the one highway trip I take every other week. I'm seeing 19.8 mpg on the dash and that's with a heavy foot in the city and the aformentioned two highway trips to my girlfriend's house.

4.10 would be the gear to get with an auto and a procharger IMO. It would hit boost very quickly and give you more than enough gear (4th goes to 130 5th 167)

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Old 01-17-2014, 02:29 PM   #19
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Originally Posted by powerwhee View Post
If you plan on putting a turbo on the car then 4.10s might not be the optimal gear, especially with a stick. With an automatic 4.10 are equal to 3.73 in the Mt82. I run 4.10 with a 26.5 inch tire. The car drives so much better. Getting on it in 1st over half throttle gets it sideways, and the shift into second has the whole car squirming around furiously. I think most people who say "don't get 4.10 it's to much gear" have never actually driven a car with 4.10. The difference in rpm in 6th gear is about 400 rpm and that's with my very short tires compared to stock 3.31 gearing with 28 inch tires. That's not much st all, but the performance in gear 1-4 are much improved.

That's not entirely true..
Factory gearing for the automatic and manual are very similar, there is about a .1 difference in ratios for 1-4th gear
5th and 6th gear, not much difference
6th gear, in a manual, has a .70 ratio. Auto has a .69

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Old 01-17-2014, 02:35 PM   #20
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Bro are you going off a spec sheet or real life expierence? I have driven both extensively. The difference between the numerical ratios might not be huge but go plug in the ratios into a calculator and see the difference in MPH. In a 3.31 geared stick car with a 7k redline and stock size tires 1st goes to 40 2nd goes to 68 3rd goes to 105 and 4th 124. With my auto and 26.5 inch tires with 7k upshifts (much shorter than stock) 1st goes to 35 2nd goes to 60 3rd goes to 97 and 4th goes to 125. 5th is a 1:1 ratio in the mt82 and 5th in the auto is an overdrive ratio. Stop just listening to people spewing bs and go see the numbers for yourself.

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Old 01-17-2014, 03:57 PM   #21
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Bro are you going off a spec sheet or real life expierence? I have driven both extensively. The difference between the numerical ratios might not be huge but go plug in the ratios into a calculator and see the difference in MPH. In a 3.31 geared stick car with a 7k redline and stock size tires 1st goes to 40 2nd goes to 68 3rd goes to 105 and 4th 124. With my auto and 26.5 inch tires with 7k upshifts (much shorter than stock) 1st goes to 35 2nd goes to 60 3rd goes to 97 and 4th goes to 125. 5th is a 1:1 ratio in the mt82 and 5th in the auto is an overdrive ratio. Stop just listening to people spewing bs and go see the numbers for yourself.

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You said
4.10s in an auto are like 3.73s in a manual.
I said that's wrong.

And I'm going by real life.
I've got a 26.5" tire as well with 3.55 diff gear.

Here's why you're wrong.
Here are numbers for cruising.
If you wanted, you could plug in each and every gear, but that'd be a waste of time.
Cruising at 70 mph with 4.10 vs 3.73
(Adjusted final gear ratio for auto vs manual.. Manual has a .70 6th, auto has a .69)
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Old 01-17-2014, 03:58 PM   #22
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And since you seem rather stubborn on the subject, here's first at 20 mph...
Auto vs manual.
Again with the adjusted 1st gear ratios and differential gear
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Old 01-17-2014, 04:03 PM   #23
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Lol that's not an effective calculator. Your just picking one speed and one gear. This is a much better calculator, that compares every gear and every mph at the same time.

http://www.f-body.org/gears/

here are the ratios for the v6 mt82 and the v6 auto. plug em in yourself and see the difference.

compare a 3.31 geared stick car with a 26.5 inch tire to a 4.10 geared auto car with a 26.5 inch tire. and then get back to me. lol idk why you refuse to believe the auto's are not geared as aggressively. with 3.31 gears my auto would hit 120 MPH in 3rd gear. A 3.31 geared stick car is at the top of 4th at 120 MPH.

Stock V6 MT-82 ratios:
4.24
2.54
1.66
1.24
1.00
0.70

Stock GT and V6 Auto ratios:
4.17
2.34
1.52
1.14
0.87
0.69
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Old 01-17-2014, 04:05 PM   #24
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With an automatic 4.10 are equal to 3.73 in the Mt82.

This is what I'm arguing against..
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Old 01-17-2014, 08:45 PM   #25
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Gears

Quote:
Originally Posted by powerwhee View Post
Yea I have done a 180 mile round trip to my girlfriends house many times, with 3.31 and 4.10. I use the same amount of fuel : half a tank round trip. The highway mpg has dropped off, and if I go over 70 it starts dropping hard, but, if I keep it @70 mph @ 2500 RPM it can easily see 26 mpg. To Me, not much of a difference in overall mpg. I do get there a little slower, but it's fine for the added performance. If anything the 4.10 increase my overall mpg but I drive all city other than the one highway trip I take every other week. I'm seeing 19.8 mpg on the dash and that's with a heavy foot in the city and the aformentioned two highway trips to my girlfriend's house.

4.10 would be the gear to get with an auto and a procharger IMO. It would hit boost very quickly and give you more than enough gear (4th goes to 130 5th 167)

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I agree 100 percent. I have first hand experience with this^
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Old 01-18-2014, 04:56 PM   #26
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Keep in mind that the steeper gear is to increase engine torque. That's a given. Then add in the automatics torque converter that also multiplies torque. Thus the automatic wouldn't need as steep a gear to get the same torque multiplication. Kind of picky but, it is what it is.
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Old 01-18-2014, 05:08 PM   #27
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I have a 2012 mustang v6 auto what would be the diff between 4.10 and 3.73??
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Old 01-18-2014, 07:16 PM   #28
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Gears

I just did 3.73 gears and moser axles (had them from a previous build laying around so they went in) in my manual. That said my last auto was a 4.6 and it had 4.30's in it. If you are auto then don't fear the gear! Manual I would say stick to 3.73 because I can start in second and it picks up faster than when I had the stock 2.73 in first. 4.10 would make first very short and you would be shifting a lot or just using 2nd all the time making first gear pretty much there for Burnouts lol.
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Old 01-19-2014, 12:28 AM   #29
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So 4.10 gears will be around $200 how much will install and all that cost??
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Old 01-19-2014, 12:55 PM   #30
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So 4.10 gears will be around $200 how much will install and all that cost??

South of Houston everyone I have talked to, even personal friend mechanics who've done this before had quoted me around 700 labor + parts (and it doesn't change dramatically from used parts or new parts...as used gears sounds like a terrible idea anyway). I'm gonna be doing this soon I'll let you know how it goes if I find a better deal.
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Old 01-19-2014, 07:34 PM   #31
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I got the gears and the install from the same shop (AZ Mustang Performance) for $490 cash
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Old 01-19-2014, 07:38 PM   #32
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3.73 with a 26" tire would get you the 4.10 . Swap tires back to your 27.6" stockers for the highway, best of both worlds. The aluminum shaft will help mileage a bunch at highway speeds. #1 Get the tuner.
Great point. Tire size height plays a big part here.
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Old 01-19-2014, 09:57 PM   #33
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I paid 600 for gears and install.
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Old 01-19-2014, 11:01 PM   #34
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I got the gears and the install from the same shop (AZ Mustang Performance) for $490 cash

I'm gonna use these lower prices to haggle my way into a cheaper deal. I was hoping to see some lower numbers.. So thank ya!
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Old 01-19-2014, 11:20 PM   #35
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I recently got a '14 v6 auto and love the car, but the 2.73 gear is lacking. This is my DD and I do a lot of highway miles, so in that respect I like the 2.73 gearing for gas mileage. If I wanted a gear that gives me good performance (something I would definitely notice versus stock), but maintain some sort of highway mpg, what would be the best choice? 3.55 or 3.73? Keep in mind I'll be running 19" AMR wheels in the summer (the package deal from AM) and the stock wheels in the winter if that factors into the gearing. I don't want 3.31, because people have that from the factory.
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