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Old 08-24-2012, 03:34 PM   #1
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3.15 Gears

How much do they suck? Are tgey even bad, no one talks about them, just want to learn something new.
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Old 08-24-2012, 05:21 PM   #2
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Re: 3.15 Gears

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Originally Posted by OzzyLiriano View Post
How much do they suck? Are tgey even bad, no one talks about them, just want to learn something new.
315,,havent heard of that one,,i heard of 331,,355,,373,,411,,etc..Is that what came with your car
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Old 08-24-2012, 05:21 PM   #3
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They were the only option on the 2011-2012 automatics. On automatics with 3.15s the launch is like 3.73s on a manual.
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Old 08-24-2012, 05:25 PM   #4
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Quote:
Originally Posted by Nygreenmachine
They were the only option on the 2011-2012 automatics. On automatics with 3.15s the launch is like 3.73s on a manual.
That's news to me, never heard that.

The 3.15's are for economy reasons, the autos are also geared differently. Don't need as steep of gears for auto. Really for these autos a lot of it comes down to shift firmness. You can still get 3.15's to run fast . Believe it or not theres more to driving autos than people give credit for
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Old 08-24-2012, 06:29 PM   #5
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Quote:
Originally Posted by Nygreenmachine
They were the only option on the 2011-2012 automatics. On automatics with 3.15s the launch is like 3.73s on a manual.
Really?? So would 3.73s or 4.10s on an auto give you a much better launch than they would on a manual? Or does the gearing just not make a major difference on the autos?
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Old 08-24-2012, 06:56 PM   #6
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Quote:
Originally Posted by Nygreenmachine
They were the only option on the 2011-2012 automatics. On automatics with 3.15s the launch is like 3.73s on a manual.
Pretty sure you've got that backwards. 4.10s on an auto would be about the same as 3.73s on a manual the autos love steep gears and a high stall, that's why people run 4.10s on the auto but top out at 3.73s or 3.90s on the manual.
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Old 08-24-2012, 07:10 PM   #7
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Originally Posted by Napoleon85

Pretty sure you've got that backwards. 4.10s on an auto would be about the same as 3.73s on a manual the autos love steep gears and a high stall, that's why people run 4.10s on the auto but top out at 3.73s or 3.90s on the manual.
So why do we get 3:15s?
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Old 08-24-2012, 07:18 PM   #8
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Quote:
Originally Posted by Mandy4

So why do we get 3:15s?
3:15s mainly for MPG I think. 2,000 RPM at 70Mph is pretty decent. Also, I would guess that Ford probably assumed that if someone was buying an automatic, they may not be as much of a performance junkie so we got no option. I'm switching my 3:15s to 3:73s next week in my 11 automatic GT. Honestly 3:15s make for a long first gear in a N/A setup IMO.
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Old 08-24-2012, 07:22 PM   #9
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Quote:
Originally Posted by doug5.0

3:15s mainly for MPG I think. 2,000 RPM at 70Mph is pretty decent. Also, I would guess that Ford probably assumed that if someone was buying an automatic, they may not be as much of a performance junkie so we got no option. I'm switching my 3:15s to 3:73s next week in my 11 automatic GT. Honestly 3:15s make for a long first gear in a N/A setup IMO.
Makes sense. I'm thinking about getting 4:10s because it's not my DD and I rarely take it on the interstate.
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Old 08-24-2012, 07:23 PM   #10
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Quote:
Originally Posted by Mandy4

Really?? So would 3.73s or 4.10s on an auto give you a much better launch than they would on a manual? Or does the gearing just not make a major difference on the autos?
I think launches are mostly always better on an automatic since there's no human error in working the clutch. A 3.73 auto would get a better launch than a 3.73 manual is my guess. Not sure on that though.
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Old 08-24-2012, 07:48 PM   #11
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Re: 3.15 Gears

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Originally Posted by Mandy4 View Post
Makes sense. I'm thinking about getting 4:10s because it's not my DD and I rarely take it on the interstate.
Thats a heck of gear,,i was thinking 373,,thats a pretty good all around gear..for my year anyway..i have 331
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Old 08-24-2012, 07:50 PM   #12
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Quote:
Originally Posted by doug5.0

3:15s mainly for MPG I think. 2,000 RPM at 70Mph is pretty decent. Also, I would guess that Ford probably assumed that if someone was buying an automatic, they may not be as much of a performance junkie so we got no option. I'm switching my 3:15s to 3:73s next week in my 11 automatic GT. Honestly 3:15s make for a long first gear in a N/A setup IMO.
Doug5.0...

Please keep us posted once you get the 3.73s!!

I know even with really good summer street tires and an aggressive tune, I had a ton of wheel spin on 3.15s at the track. Interesting to see how much worse the launches would be. I imagine day to day would be a blast with the 3.73s. I would consider keeping the 3.15s if I go with a supercharger though. 3.73s and 4.10s would just melt The tires at WOT launch (but oooohhhhh.... It would smell so right).
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Old 08-24-2012, 07:52 PM   #13
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Re: 3.15 Gears

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Originally Posted by Napoleon85 View Post
Pretty sure you've got that backwards. 4.10s on an auto would be about the same as 3.73s on a manual the autos love steep gears and a high stall, that's why people run 4.10s on the auto but top out at 3.73s or 3.90s on the manual.
Whats your opinion on 373 with auto and sc..I heard some controversy about a sc pulls better with 331 verses a 373 in a quater,,now im not sure,,and a 355,,prob wouldnt be worth the trouble..Ill eventually learn more about the sc..ive been reasearching for a while,,but it always back and forth
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Old 08-24-2012, 09:35 PM   #14
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Put 3.73s. They're great. Nuff said
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Old 08-24-2012, 11:55 PM   #15
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Quote:
Originally Posted by nhcowboy

Doug5.0...

Please keep us posted once you get the 3.73s!!

I know even with really good summer street tires and an aggressive tune, I had a ton of wheel spin on 3.15s at the track. Interesting to see how much worse the launches would be. I imagine day to day would be a blast with the 3.73s. I would consider keeping the 3.15s if I go with a supercharger though. 3.73s and 4.10s would just melt The tires at WOT launch (but oooohhhhh.... It would smell so right).
Yeah I totally agree. I could never hook up at Fontana with traction control off, I can only imagine I'd need DRs to do it with the 3.73s. Dropping off Tuesday, picking up Thursday... Need new tires Friday I'm not planning FI right now... If that changes I'll go back to 3.15s for sure.

---------- Post added at 09:55 PM ---------- Previous post was at 09:52 PM ----------

Quote:
Originally Posted by Mandy4

Makes sense. I'm thinking about getting 4:10s because it's not my DD and I rarely take it on the interstate.
4.10s is pretty crazy, but if your not going to SC or turbo it... Eff it, balls to the wall!
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Old 08-24-2012, 11:56 PM   #16
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Quote:
Originally Posted by mymustang

Whats your opinion on 373 with auto and sc..I heard some controversy about a sc pulls better with 331 verses a 373 in a quater,,now im not sure,,and a 355,,prob wouldnt be worth the trouble..Ill eventually learn more about the sc..ive been reasearching for a while,,but it always back and forth
Might be fine on an auto, but it's still gonna be pretty steep I think.
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Old 08-25-2012, 07:43 AM   #17
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Quote:
Originally Posted by doug5.0

4.10s is pretty crazy, but if your not going to SC or turbo it... Eff it, balls to the wall!
Haha, is it crazy? I like balls to the wall.
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Old 08-25-2012, 07:50 AM   #18
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Re: 3.15 Gears

havent heard that expression in a while,,we used to say that when we got busy at work..lol
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Old 08-25-2012, 08:55 AM   #19
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Nah you want balls to the wall go 4.56 lol
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Old 08-25-2012, 03:56 PM   #20
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Re: 3.15 Gears

I have the Auto with the 3.15 so I'm told when I went from my stock 19" wheels with 255/45/19 to 275/40/18 that my gearing had changed and if so what could I compare it to ?
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Old 08-26-2012, 07:33 PM   #21
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Much to think about here! I wanted the 373, but got the standard 331 on my manual 13 GT, and glad because I do use it as a daily driver... With the wheel spin in first being tricky even with 255/40 19 tires. Maybe later it will hook well, but not enough now to make a difference. Depends on what you use it for, what RPMs you are ready for, and what the car is used for. You have many more questions to ask... Such as daily use, mileage, highway, racing, 1/4 mile, 1/8, and what you can handle. Good luck! I hope you make the right choice.
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Old 08-26-2012, 07:50 PM   #22
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Quote:
Originally Posted by nhcowboy

Doug5.0...

Please keep us posted once you get the 3.73s!!

I know even with really good summer street tires and an aggressive tune, I had a ton of wheel spin on 3.15s at the track. Interesting to see how much worse the launches would be. I imagine day to day would be a blast with the 3.73s. I would consider keeping the 3.15s if I go with a supercharger though. 3.73s and 4.10s would just melt The tires at WOT launch (but oooohhhhh.... It would smell so right).
I've got 3.73 on my auto and it launches well, as long as you have some sticky/wide tires and a good set of lca's. I still get wheel spin, but it's not as bad as I thought it would be. I actually get some spin from 2-3 as well. Over all, I love the 3.73s
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Old 08-27-2012, 05:55 PM   #23
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If I were you with an auto and do highway/daily drive I would do the 373. I might upgrade my 331 (manual) later if I can get a good hook.
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Old 08-27-2012, 07:04 PM   #24
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Re: 3.15 Gears

Mine don't bother me. I get decent mpg. The auto is so low geared I'm usually going into 3rd gear by the time I get out of a parking lot/intersection and get up to about 15 mph or so. I think anything much deeper would drive me nuts with the shifts being that much sooner. I think I hit 6th around 45 or so anyway.
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Old 07-01-2016, 10:11 PM   #25
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I realize this is an old thread but I need to ask something.

So I've been thinking about getting 3.73s on my 2016 V6 auto and I have 3.15s stock. I was told by several people I can't upgrade to 373s because my car has stock 3.15s. Anyone know anything about this? This info came from two major players in the Mustang world.

Thanks in advance for any response
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Old 07-01-2016, 10:45 PM   #26
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Originally Posted by Steve Roylance View Post
I realize this is an old thread but I need to ask something.

So I've been thinking about getting 3.73s on my 2016 V6 auto and I have 3.15s stock. I was told by several people I can't upgrade to 373s because my car has stock 3.15s. Anyone know anything about this? This info came from two major players in the Mustang world.

Thanks in advance for any response

Nice bump on a 4 year old thread.


Yes you can switch out the gears. They are wrong
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Old 07-02-2016, 12:30 AM   #27
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Originally Posted by Steve Roylance View Post
I realize this is an old thread but I need to ask something.

So I've been thinking about getting 3.73s on my 2016 V6 auto and I have 3.15s stock. I was told by several people I can't upgrade to 373s because my car has stock 3.15s. Anyone know anything about this? This info came from two major players in the Mustang world.

Thanks in advance for any response

Will only hurt Performance

3.15 on the 6r80 is enough gear and anything else wouldn't help you.

Will help if you had a manual but not for the auto.

Put your money towards a new converter if you really want performance
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Old 07-02-2016, 05:46 AM   #28
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They are correct you cannot just swap gears from 3.15's to 3.73's on the 2015 up cars. For one the housing is to small. You would need to buy a whole 3.73 rear and it still wouldn't run. You would then need to buy the Whipple flare tool to make the changes in the BCM. You cannot adjust for the gearing in the PCM like in previous years. It will be very expensive and probably not worth it in the end.
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Old 07-02-2016, 06:55 AM   #29
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Thank you for all the replies! I appreciate it

Looks like for now I'm gonna get some of the basics. BBK LTH, 73mm TB, Exhaust....etc. Already have a MPT race tune and Roush CAI and I already like how they turned out. My buddy has the 2016 GT he drove my car the other day and was very impressed with the power from just these two mods.
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Old 07-02-2016, 07:56 AM   #30
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Why do all those mods to a V6? You could have bought a GT from the start.
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Old 07-02-2016, 09:06 AM   #31
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Originally Posted by Grabber Blue5.0 View Post
They are correct you cannot just swap gears from 3.15's to 3.73's on the 2015 up cars. For one the housing is to small. You would need to buy a whole 3.73 rear and it still wouldn't run. You would then need to buy the Whipple flare tool to make the changes in the BCM. You cannot adjust for the gearing in the PCM like in previous years. It will be very expensive and probably not worth it in the end.
This is some great info! I'm running 373s on my 13 and would have thought the swap would have been just as easy in the 15 IRS. Makes a huge difference knowing this in advance if I go with a 15+ in the future.

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Old 07-02-2016, 12:16 PM   #32
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Why do people keep resuscitating these threads from 4 years ago in the last couple days? Just make a new thread if you have new information or want to make an an inquiry. Whatever was relevant about this thread in 2012 has either proven or disproven a million times over by now.
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Old 07-02-2016, 12:24 PM   #33
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The person that resterrected this thread has 2 post and probably stumbled onto it using a search like Google, relax.
Who cares if it's been 4 years, if your not interested just back out of the thread and move along.....
This might be completly new info to him regardless.


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Old 07-02-2016, 12:25 PM   #34
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^ people get flamed for starting new threads and for when they revive an old one. Hmm.
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Old 07-02-2016, 12:40 PM   #35
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Why do all those mods to a V6? You could have bought a GT from the start.
I find it more satisfying smoking a GT in a V6 than in a GT
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