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Old 07-07-2013, 03:55 PM   #1
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Noob question about gear ratio's

So I have read a thousand or so posts since getting my 2013 Race Red V6 two weeks ago. I see the rear gears is a great way to upgrade the performance. My question is I see so many people that have 2.73 gears. The Ford spec page says the manual has the 2.73 or 3.31, and the automatic is listed as 3.31 only. I have purchased the automatic V6. That many of you have manual? If I have the 3.31, is there still a significant difference in performance by going 3.55 or 3.73? It's about $600 for a gear change. I like performance but am not a racer. I want to make sure my dollars are spent wisely.
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Old 07-07-2013, 04:40 PM   #2
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So I have read a thousand or so posts since getting my 2013 Race Red V6 two weeks ago. I see the rear gears is a great way to upgrade the performance. My question is I see so many people that have 2.73 gears. The Ford spec page says the manual has the 2.73 or 3.31, and the automatic is listed as 3.31 only. I have purchased the automatic V6. That many of you have manual? If I have the 3.31, is there still a significant difference in performance by going 3.55 or 3.73? It's about $600 for a gear change. I like performance but am not a racer. I want to make sure my dollars are spent wisely.
Not sure where you're seeing that, but for the 2013 model they come stock with 2.73. The 3.31 is a part of the performance package. Not a standalone option.

You have 2.73, and there will definitely be a significant difference between 2.73 and 3.55 or 3.73.

Really depends on what kind of driving you do mostly (city or highway) as you'll lose some MPGs on the highway as you gear down. If you're mostly highway I'd go 3.55, but if you're mixed I'd go 3.73. Either way it's a significant difference over the 2.73 (which you have).
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Old 07-07-2013, 04:49 PM   #3
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Not sure where you're seeing that, but for the 2013 model they come stock with 2.73. The 3.31 is a part of the performance package. Not a standalone option.

You have 2.73, and there will definitely be a significant difference between 2.73 and 3.55 or 3.73.

Really depends on what kind of driving you do mostly (city or highway) as you'll lose some MPGs on the highway as you gear down. If you're mostly highway I'd go 3.55, but if you're mixed I'd go 3.73. Either way it's a significant difference over the 2.73 (which you have).
The 3.31s are not just on the Perf Package cars. They are available as a stand alone option, actually. Manual or auto. But +1 on everything else.
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Old 07-07-2013, 04:51 PM   #4
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Really?? My bad. They must have changed it for the 2014 model year.
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Old 07-07-2013, 05:05 PM   #5
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Thanks.
This is where I'm confused. This is a Ford document which shows two ratios for manual trans and just the 3.31 in the optional automatic.....
http://media.ford.com/images/10031/2...tang_Specs.pdf
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Old 07-07-2013, 05:09 PM   #6
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VIG said it best. So the question is what gears do you currently have. You can look up under your car at the axle. You should see a sticker on there stating what gear you have. If you have a 2.73, upgrading is a plus and you will definitely be able to tell the difference. So take a look and see what you have, then check the gear threads to see what people are talking about.
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Old 07-07-2013, 05:23 PM   #7
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Tyriqq, thanks! I just looked and there was a sticker on the rear. Indeed I have 2.73. I'm gonna have to change that........
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Old 07-07-2013, 06:46 PM   #8
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There is quite a big jump with the 3.31, so a 3.55 would be even better. I myself spend most of my time on the highway so my 3.31 gears are fine.
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Old 07-07-2013, 06:50 PM   #9
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I'm actually thinking about going 3.31 because I can keep the stock tune (Ford can recalibrate the speedo since 3.31 is one of their offered setups) so they can't bust my chops about that, plus I do 90% highway driving.
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Old 07-07-2013, 11:28 PM   #10
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Thanks.
This is where I'm confused. This is a Ford document which shows two ratios for manual trans and just the 3.31 in the optional automatic.....
http://media.ford.com/images/10031/2...tang_Specs.pdf


I don't believe Ford put that out. It also says 5 qts of oil when it takes 6.

I have 3:31 automatic and got 29 mpg strictly highway on a recent trip at 70 mph.
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Old 07-08-2013, 08:16 PM   #11
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Man, I can barely get 23.7 doing mostly 65 on the 2.78 gears. How are you guys getting such good mileage?

But, I do want the 3.31's eventually.
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Old 07-08-2013, 08:21 PM   #12
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Man, I can barely get 23.7 doing mostly 65 on the 2.78 gears. How are you guys getting such good mileage?

But, I do want the 3.31's eventually.
I have 2.73 gears, drove for over an hour at 70 miles an hour on the highway and could not achieve over 26.2 mpg. Stock no upgrades with 93 octane fuel.
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Old 07-08-2013, 08:34 PM   #13
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I have 2.73 gears, drove for over an hour at 70 miles an hour on the highway and could not achieve over 26.2 mpg. Stock no upgrades with 93 octane fuel.
I am at 5k feet so maybe that's it... kinda sucks. I think 55 is about the only way.
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Old 07-08-2013, 08:39 PM   #14
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I am at 5k feet so maybe that's it... kinda sucks. I think 55 is about the only way.
Ya I'm in Florida at basically sea level give or take 10 feet above or below. So you would think it be optimal.
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Old 07-08-2013, 11:10 PM   #15
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Man, I can barely get 23.7 doing mostly 65 on the 2.78 gears. How are you guys getting such good mileage?

But, I do want the 3.31's eventually.
Some of my trip was uphill to 5k feet but mostly 1000 - 1500 ft levels. Set it on cruise control at 70 mph.
Gauge said 27.5 mpg but manually checking it was 29. Half freeway and half round town I get about 22. Usually a half gallon better than what the mpg gauge says. Even 26 with a 305 hp engine is good for me. My Pt Cruiser was 26 mpg and 150 hp 4 cylinder manual trans. Can't complain. I use 87 octane in Calif.
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Old 07-09-2013, 01:21 AM   #16
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Last week I did a 1200~ mile round trip from Kentucky to Alabama. I averaged around 75mph doing interstate travel, not including the city/construction zones that briefly went lower. I averaged around 32mpg going down, 31mpg comping back up.
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Old 07-09-2013, 04:46 AM   #17
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I have 2.73 gears, drove for over an hour at 70 miles an hour on the highway and could not achieve over 26.2 mpg. Stock no upgrades with 93 octane fuel.
I filled up yesterday, drove 40 miles to the dealer to drop the car off for a door brace in the right door and it was sitting at 30.1, and that is going up and down hills with my 3.31's and 87 octane 100% gas.
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Old 07-09-2013, 05:12 AM   #18
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I filled up yesterday, drove 40 miles to the dealer to drop the car off for a door brace in the right door and it was sitting at 30.1, and that is going up and down hills with my 3.31's and 87 octane 100% gas.
That is a good point. 100% gas gets better mileage. When my car was stock I clocked 31 mpg on long trips, now with all of my mods and a race tune and a lead foot I get 30mpg on the highway. I could get more if I ran a street tune or drove like a civilized human

---------- Post added at 06:12 AM ---------- Previous post was at 06:08 AM ----------

On the other note I would upgrade to 3.73's IF you are looking to upgrade. Don't waste your money on a minor change to 3.31's or 3.55's.
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Old 07-09-2013, 07:11 AM   #19
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I got 3.55's but that's because I do alot of highway commuting.
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Old 07-09-2013, 09:12 AM   #20
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On the other note I would upgrade to 3.73's IF you are looking to upgrade. Don't waste your money on a minor change to 3.31's or 3.55's.
I think that would be too low for me. I commute. 3.31 would make more sense for fuel economy. The damn ethanol blend year round in NM sucks.
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Old 07-09-2013, 09:18 AM   #21
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I think that would be too low for me. I commute. 3.31 would make more sense for fuel economy. The damn ethanol blend year round in NM sucks.
http://pure-gas.org

Use that to see if you have a station close to you. That's how I found my local station. I only use 100% gas in my car.

---------- Post added at 10:18 AM ---------- Previous post was at 10:17 AM ----------

And BTW if you are looking for fuel economy stick with your stock gears. If you want to upgrade the performance get 3.73s

Thats my opinion
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Old 07-09-2013, 09:23 AM   #22
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I want a mix of the two. Hence the 3.31 from the performance package.
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Old 07-09-2013, 09:27 AM   #23
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I want a mix of the two. Hence the 3.31 from the performance package.
I have the performance package and I will be upgrading to 3.73s in the future.

At minimum get the 3.55s

---------- Post added at 10:27 AM ---------- Previous post was at 10:26 AM ----------

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I want a mix of the two. Hence the 3.31 from the performance package.
Do you have a 3.7?
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Old 07-09-2013, 09:28 AM   #24
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Yup.
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Old 07-09-2013, 09:30 AM   #25
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Yup.
Have you driven a pp v6?
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Old 07-09-2013, 09:31 AM   #26
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I get 23 avg mpg combined with a 4.10 and procharger. I think you guys with only 2.73s should be getting upwards of 30
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Old 07-09-2013, 09:33 AM   #27
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Have you driven a pp v6?
A manual. So it was a bit different.

---------- Post added at 08:33 AM ---------- Previous post was at 08:32 AM ----------

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I get 23 avg mpg combined with a 4.10 and procharger. I think you guys with only 2.73s should be getting upwards of 30
I think 26 isn't terrible, but even babying it I would expect better.
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Old 07-09-2013, 09:40 AM   #28
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A manual. So it was a bit different.

---------- Post added at 08:33 AM ---------- Previous post was at 08:32 AM ----------



I think 26 isn't terrible, but even babying it I would expect better.
What type of driving do you do? You are saying you only get 26 hwy mpg with 2.73s? And an auto? That's sounds insanely low. You may want to change your air filter and spark plugs.

I get 24-26 city mpg and I drive like a maniac lol
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Old 07-09-2013, 10:18 AM   #29
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I do 75 on the interstate for 7 miles and then 65 on a back road for another 20 per day each way. As I think of it more; it's uphill in one direction and down the other.

That's probably why.

On a straight trip in from the dealership to the house (downhill) it was 28. And I am a fatass...so that probably does not help. LOL
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Old 07-09-2013, 10:30 AM   #30
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On my 13 automatic, I get 26-27mpg hwy with 3.73's driving at 70 mph. I got 29 mpg hwy with 3.31's. But the performance jump from 3.31's to 3.73's is tremendous. Well worth the swap imo.
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Old 07-09-2013, 12:44 PM   #31
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Last week I did a 1200~ mile round trip from Kentucky to Alabama. I averaged around 75mph doing interstate travel, not including the city/construction zones that briefly went lower. I averaged around 32mpg going down, 31mpg comping back up.
Yeah I did 3700 miles round trip from Cali to Oklahoma to Texas and back and averaged 27.9 total trip including a lot of in town driving.

I just put my CAI on and I would imagine it would have been about 29-30mpg
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Old 07-09-2013, 02:08 PM   #32
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On my 13 automatic, I get 26-27mpg hwy with 3.73's driving at 70 mph. I got 29 mpg hwy with 3.31's. But the performance jump from 3.31's to 3.73's is tremendous. Well worth the swap imo.
Good advice and welcome to the site. Love the stang
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Old 07-09-2013, 02:21 PM   #33
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for those changed the gears. how much shop labor cost should i expect for the install?
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Old 07-09-2013, 03:27 PM   #34
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for those changed the gears. how much shop labor cost should i expect for the install?
Varies by area you live in, I've seen from $200 to $600 just for labor/install, not including parts/gears. Its best to look for a highly recommended shop (I went to our local drag racing forum to see who was recommended) or a shop that will guarantee the install. Last thing you want is gear whine or worse yet have to buy new gears, install kit and pay for it to be done again.
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Old 07-09-2013, 04:17 PM   #35
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Varies by area you live in, I've seen from $200 to $600 just for labor/install, not including parts/gears. Its best to look for a highly recommended shop (I went to our local drag racing forum to see who was recommended) or a shop that will guarantee the install. Last thing you want is gear whine or worse yet have to buy new gears, install kit and pay for it to be done again.
Thank you sir!
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