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Old 09-18-2014, 01:03 PM   #36
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That's exactly what I have in mind voltwings!

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Old 09-18-2014, 01:05 PM   #37
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That's exactly what i have in mind voltwings! Rpm moving faster...

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Old 09-18-2014, 01:56 PM   #38
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Volt you are correct on all of your 5.0 points. 3.15/3.31 is faster in the GT for the 1/4 mile.

However, in the Cyclone community there is very much evidence to support 4.10's as the best auto gear for the quarter. Jon Lund put 4.10's on his stalled shop V6, it only ran 13.0, but that was his choice back in 2010.

Now I admit this isn't a one size fits all, as I've seen a number of 3.7's show a loss of power up top in the RPM range, but then there are 3.7's who make power up to 7k. Ideally you want to trap around max power, and with 4.10's you get into the power band quicker (and if your power doesn't fall off greatly at 7k rpm) stay at max power without falling below the powerband.

A lot of members are just on facebook now, stopped using forums, so the data isn't readily available at this site. Full bolt on 4.10 autos are in the 12.8-13.0 range, while 3.73 autos are in the 13.0-13.2 range.

CFM ran 4.10's in their procharged car as it was obviously making more power at higher RPM. Their turbo car makes power lower in the range (and falls off up top) so they opted for a taller gear (3.55) to stay in the powerband longer. This is the same mindset as the 5.0, it has much more torque lower in the rev range than the 3.7 does.
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Old 09-18-2014, 02:02 PM   #39
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Volt you are correct on all of your 5.0 points. 3.15/3.31 is faster in the GT for the 1/4 mile.

However, in the Cyclone community there is very much evidence to support 4.10's as the best auto gear for the quarter. Jon Lund put 4.10's on his stalled shop V6, it only ran 13.0, but that was his choice back in 2010.

Now I admit this isn't a one size fits all, as I've seen a number of 3.7's show a loss of power up top in the RPM range, but then there are 3.7's who make power up to 7k. Ideally you want to trap around max power, and with 4.10's you get into the power band quicker (and if your power doesn't fall off greatly at 7k rpm) stay at max power without falling below the powerband.

A lot of members are just on facebook now, stopped using forums, so the data isn't readily available at this site. Full bolt on 4.10 autos are in the 12.8-13.0 range, while 3.73 autos are in the 13.0-13.2 range.

That was my entire point on mentioning the 5.0 was in regards to the stock torque converter. If the 4.10 really is the best then more power to yall, but just seems excessive to me. It may get you into the powerband quicker, but it also means you spend less time in the powerband once you get there. Food for thought.
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Old 09-18-2014, 02:26 PM   #40
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I'm getting ready to replace my gears, But I'm not sure if I should go with 3.73 or 4.10. It's a v6 auto. Current mods include cai, bama tunes, Ford racing exhaust, eibach suspension, brembo brakes, eibach anti sway bar . Any feedback would be appreciated.

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Old 09-18-2014, 02:27 PM   #41
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I vote 3.73's bundled with a tuner. You'll get the most benefit from the gear change with the tuner. Unless you have a specific plan in mind, 3.73 is about the best all around gear choice for about all applications.


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Old 09-18-2014, 03:00 PM   #42
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Originally Posted by LiveWire003 View Post
Volt you are correct on all of your 5.0 points. 3.15/3.31 is faster in the GT for the 1/4 mile.

However, in the Cyclone community there is very much evidence to support 4.10's as the best auto gear for the quarter. Jon Lund put 4.10's on his stalled shop V6, it only ran 13.0, but that was his choice back in 2010.

Now I admit this isn't a one size fits all, as I've seen a number of 3.7's show a loss of power up top in the RPM range, but then there are 3.7's who make power up to 7k. Ideally you want to trap around max power, and with 4.10's you get into the power band quicker (and if your power doesn't fall off greatly at 7k rpm) stay at max power without falling below the powerband.

A lot of members are just on facebook now, stopped using forums, so the data isn't readily available at this site. Full bolt on 4.10 autos are in the 12.8-13.0 range, while 3.73 autos are in the 13.0-13.2 range.

CFM ran 4.10's in their procharged car as it was obviously making more power at higher RPM. Their turbo car makes power lower in the range (and falls off up top) so they opted for a taller gear (3.55) to stay in the powerband longer. This is the same mindset as the 5.0, it has much more torque lower in the rev range than the 3.7 does.
Well put. You hit the nail on the head.

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Old 09-18-2014, 03:09 PM   #43
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Originally Posted by Voltwings View Post
That was my entire point on mentioning the 5.0 was in regards to the stock torque converter. If the 4.10 really is the best then more power to yall, but just seems excessive to me. It may get you into the powerband quicker, but it also means you spend less time in the powerband once you get there. Food for thought.
You actually spend more time in the power band. Its no secret that the power band in these 3.7s are 3500 and above, so with 3.73/3.90s/410s you get there very quickly and if your doing a full 6 gear pull shifting between gears lands me right back to 3500 rpm in the next gear. So in turn I can be in the power band till I hit the governor. There really is no right or wrong, just personal preference. That being said I've never seen anyone put anything larger than 4.10s on a 3.7. Majority are 3.55s and 3.73s with a few 4.10s.

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Old 09-18-2014, 03:17 PM   #44
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Op I'm moving up to 4.10s from 3.73's on my 13' auto. I wanted to go with 4.30's but Ford does not make them anymore (I can't find any old stock on the shelves anywhere) and I won't run any gears but FRPP gears made by Ford ending in A not M. For a auto car to be about equal in terms of gear ratio to a 3.73 geared manual car, the auto will have to have 4.10 gears. This is taking in to account the same size tire.
4.10 is not to much gear for our auto 6 speed cars. 4.30's are borderline and 4.56 would be to much imo. Once you go as low as 3.73 your gas goes to crap on the auto, might as well go bigger from the start (wish I would have).
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Old 09-18-2014, 03:42 PM   #45
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How about you guys here that have manual shift transmissions? What is your opinion please between going to 3.55 or going with the 3.73's in the v6??

I am trying to decide between 3.55 and 3.73 to install in my 2014 3.7 manual shift v6


Did 3.73 make it where you are shifting too much or shifting a lot more often than you care for?
...or does 3.73 make it rev too high at 80 mph going down the freeway?
...or with 3.73 the gas mileage suffered too much?


Or ...

Do some of you who did 3.55 wish you had installed 3.73 instead?

Maybe 3.55 just didn't give you enough grunt and enough more torque, and now that you've had the 3.55's a while you wish you would have installed 3.73 instead?


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Old 09-18-2014, 03:51 PM   #46
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How about you guys here that have manual shift transmissions? What is your opinion please between going to 3.55 or going with the 3.73's in the v6??

I am trying to decide between 3.55 and 3.73 to install in my 2014 3.7 manual shift v6


Did 3.73 make it where you are shifting too much or shifting a lot more often than you care for?
...or does 3.73 make it rev too high at 80 mph going down the freeway?
...or with 3.73 the gas mileage suffered too much?


Or ...

Do some of you who did 3.55 wish you had installed 3.73 instead?

Maybe 3.55 just didn't give you enough grunt and enough more torque, and now that you've had the 3.55's a while you wish you would have installed 3.73 instead?


.
IMO you can't go wrong with either gear. Love my 3.73s, mpg still pretty good. I'm sure I would have been just as happy with 3.55s.

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Old 09-18-2014, 04:04 PM   #47
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Originally Posted by FastFord13 View Post

IMO you can't go wrong with either gear. Love my 3.73s, mpg still pretty good. I'm sure I would have been just as happy with 3.55s.


2013 3.7 ... 3.73 ford racing gears...

FastFord13,

Questions please...

What size tires do you have?

How many RPM at 80 mph?

How many mpg now after installing 3.73?

Do you feel like you have to shift quite a bit more often with 3.73?

Is 1st gear pretty much useless, meaning it goes by too quickly and you feel like you can start from a traffic light in 2nd gear instead of 1st?


Many Thanks. Your help is appreciated.


.
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Old 09-18-2014, 04:15 PM   #48
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Originally Posted by GT 1 View Post
FastFord13,

Questions please...

What size tires do you have?

How many RPM at 80 mph?

How many mpg now after installing 3.73?

Do you feel like you have to shift quite a bit more often with 3.73?

Is 1st gear pretty much useless, meaning it goes by too quickly and you feel like you can start from a traffic light in 2nd gear?


Many Thanks. Your help is appreciated.


.
19s

At 120km I'm around 21-23 rpm.

Mpg, my city can be pretty scary at times because of my right foot, I've seen it as high as 20liters per 100km. Highway is surprisingly pretty good between 8-9 litres per 100km, BUT I cruise around 110kmh.

Shifting, depends how you drive it, tbh I really didn't notice much more shifting. Around town its not crazy,if anything places I'd be in 3rd with 2.73, I might sometimes be in forth.

First gear is awesome compared to the 2.73s.

Sorry kinda brief but on my way out so I hope this helps. Just do it, gears should have been my first mod!!!!!

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Old 09-18-2014, 04:18 PM   #49
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You actually spend more time in the power band. Its no secret that the power band in these 3.7s are 3500 and above, so with 3.73/3.90s/410s you get there very quickly and if your doing a full 6 gear pull shifting between gears lands me right back to 3500 rpm in the next gear. So in turn I can be in the power band till I hit the governor. There really is no right or wrong, just personal preference. That being said I've never seen anyone put anything larger than 4.10s on a 3.7. Majority are 3.55s and 3.73s with a few 4.10s.

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I mean literally time, like seconds. My 3.31 car was faster than a lot of 3.73 and 4.10 cars because I could hold a gear out longer (more time IN the powerband) whereas they would have to shift and come back into it.


However, in the 1/4, I suppose the steeper gear could provide some advantage since you're really trying to go "quick," not "fast."
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Old 09-18-2014, 04:24 PM   #50
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Thank you fastFord13


Questions please for those who have manual shift cars with 3.73 gears...

Is 1st gear pretty much useless, meaning it goes by too quickly and you feel like you can start from a traffic light in 2nd gear instead of 1st gear?

Do you feel like you have to shift quite a bit more often with 3.73 than you did stock?

What size tires do you have?

How many RPM at 80 mph?

How many mpg now after installing 3.73?


Many Thanks. Your help is truly appreciated.


.
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Old 09-18-2014, 04:35 PM   #51
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I mean literally time, like seconds. My 3.31 car was faster than a lot of 3.73 and 4.10 cars because I could hold a gear out longer (more time IN the powerband) whereas they would have to shift and come back into it.


However, in the 1/4, I suppose the steeper gear could provide some advantage since you're really trying to go "quick," not "fast."
I see what your saying. Thumbs. I think we can all agree that ANY gear choice with simple bolt ons is better than my old 2.73s! Lol They were god awful.

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Old 09-18-2014, 07:20 PM   #52
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I see what your saying. Thumbs. I think we can all agree that ANY gear choice with simple bolt ons is better than my old 2.73s! Lol They were god awful.

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when we were test driving my GFs new car, I told her she had missed 3rd and gone into 5th, because there was no way we'd be under 3k in 3rd at 50 mph ... I was wrong lol. The 2.73 is WAY too much gear.
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Old 09-19-2014, 09:44 AM   #53
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Question please for guys with * 3.73 * manual shift cars

What RPM are you going at 80 MPH, and is 1st gear pretty much useless, meaning 1st gear is over in only a couple of seconds, and you can take off from a traffic light in 2nd gear?
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Old 09-19-2014, 06:31 PM   #54
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Finally found a chart that shows MPH at whatever RPM with whichever Gear...

Results for 2.73 - vs - 3.73 are...

1850 RPM - vs - 2600 RPM at 80 MPH with stock size v6 17 inch tires - subtract about 2 mph for stock size 18 inch tires


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Old 09-19-2014, 06:32 PM   #55
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So, the question remaining is, with 3.73 is 1st gear pretty much useless?

What I mean is 1st gear over in only a couple of seconds before you have to shift to 2nd, and you can take off from a traffic light in 2nd gear?


.
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Old 09-19-2014, 07:37 PM   #56
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Yes, it is useless IMO. The 1st gear in a V6 transmission is 4.2:1. Think about that for a second. The V6 has a very similar overall performance to a PI 2V or a 3V car. The 1st gear ratio in those cars is 3.37:1. Running a 3.73 in a 2011+ V6 is about like running a set of 4.56s in a 2010 down GT as far as 1st gear goes. Running a set of 3.15s in the 2011 is more along the lines of 3.73s in a 2010 down GT as far as 1st gear.

Although if you are worried about performance in a straight line, you should have got the auto.
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Old 09-19-2014, 07:53 PM   #57
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Yes, it is useless IMO. The 1st gear in a V6 transmission is 4.2:1. Think about that for a second. The V6 has a very similar overall performance to a PI 2V or a 3V car. The 1st gear ratio in those cars is 3.37:1. Running a 3.73 in a 2011+ V6 is about like running a set of 4.56s in a 2010 down GT as far as 1st gear goes. Running a set of 3.15s in the 2011 is more along the lines of 3.73s in a 2010 down GT as far as 1st gear.

Although if you are worried about performance in a straight line, you should have got the auto.
Wow, are you so wrong about first gear. I and others who actually own a 13 manual with 3.73 will agree. Maybe drive a new manual with 3.73s and then comment on them. 2011 Mustang 3.7 V6 with Lethal Performance O/R X…: http://youtu.be/7E9oNnS_0Pw

3.7 with 3.55s manual. 2011 mustang v6 3.55 gears with new tune: http://youtu.be/NNVkn1RxiVM

3.7 with 2.73 manual. 14 Mustang V6 0-60 (Before Tune): http://youtu.be/EnlPlZ5xrfo

Notice the first gear pulls on the two and how "useless 1st has become! (Sarcasm) Hope these comparisons will help clarify the most popular gear choices 3.55/3.73 (minus the 2.73s) for our 3.7 mustangs. But maybe we can kick the dead horse a little more.


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Old 09-19-2014, 08:28 PM   #58
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The manuals and automatics have different ratios. The Auto has a 4.17 1st gear. So a 3.73 in the auto is a combined gear of 15.55. Now let's compare that gear to a Mustang with the TR3650 transmission. Divide by their first gear ratio which is 3.38 and you now have 4.601.

A 3.73 gear in the 11+ auto is the equivalent of putting a 4.601 gear into a car with the TR3650 transmission

Better yet, compare a 2011 Mustang with the MT82 against the Auto.

1st gear Manual. 3.66x 3.73 = 13.65
1st gear Auto. 4.17x 3.73 = 15.55

So to find out the equivalent. 15.55/3.66 = 4.248. If you put a 3.73 in an automatic transmission that is the equivalent of a 4.248 in the manual. 4.10s in the Auto would be 4.67 in the Manual. So yes, that high of a gear in the auto, 1st gear is useless.
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Old 09-19-2014, 08:35 PM   #59
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The manuals and automatics have different ratios. The Auto has a 4.17 1st gear. So a 3.73 in the auto is a combined gear of 15.55. Now let's compare that gear to a Mustang with the TR3650 transmission. Divide by their first gear ratio which is 3.38 and you now have 4.601.

A 3.73 gear in the 11+ auto is the equivalent of putting a 4.601 gear into a car with the TR3650 transmission

Better yet, compare a 2011 Mustang with the MT82 against the Auto.

1st gear Manual. 3.66x 3.73 = 13.65
1st gear Auto. 4.17x 3.73 = 15.55

So to find out the equivalent. 15.55/3.66 = 4.248. If you put a 3.73 in an automatic transmission that is the equivalent of a 4.248 in the manual. 4.10s in the Auto would be 4.67 in the Manual. So yes, that high of a gear in the auto, 1st gear is useless.
Dead horse.
I am well aware that the auto and manual have different first gear ratios. We are also talking about an engine(3.7) that has the power band in a completely different area than any pre 2011 mustang. The mt 82 in an old 4.6 or 4.0 with 3.73s wouldn't work because of where your power ban is, but its not the case with the 3.7s where the power is all up top. We really must stop comparing older mustang set ups that is completely different with the 2011+ auto and manuals. I'm not trying to start another gear war, just explaining what works from first hand experience.
Experience over speculation.

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Old 09-19-2014, 08:44 PM   #60
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Mustangs stopped having low down power when they introduced the OHC, ever since they brought that it's pretty much all top end power.


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Old 09-19-2014, 08:46 PM   #61
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Even if the power is all at the top there is a point where you have too much gear and gotta step it down a bit.


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Old 09-19-2014, 09:01 PM   #62
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OK your right. I guess everyone who has done 3.55s and 3.73s, the most popular gear swap selections on the 3.7s are incorrect.

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GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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Old 09-19-2014, 09:11 PM   #63
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Lol, tell me where the low end on my 4.6 went, I'd love for someone to tell me where it ran off to. They all make their power up top since 96.
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Old 09-19-2014, 09:14 PM   #64
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Quote:
Originally Posted by FastFord13 View Post
OK your right. I guess everyone who has done 3.55s and 3.73s, the most popular gear swap selections on the 3.7s are incorrect.

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.

That's why it matters on the transmission............. Look at the first 3 posts of the thread and let me know.


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Old 09-19-2014, 09:30 PM   #65
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Quote:
Originally Posted by scottydsntknow View Post
Lol, tell me where the low end on my 4.6 went, I'd love for someone to tell me where it ran off to. They all make their power up top since 96.
Redline at 5800.....hmmmmm if you call that up top.

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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Old 09-19-2014, 09:31 PM   #66
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That's why it matters on the transmission............. Look at the first 3 posts of the thread and let me know.


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Just watch the 3 vids I posted and tell me if first gear is useless on the 3.7, all manuals. Look I'm not going to argue with you guys anymore, the one thing we can agree on is to disagree, and let's leave it at that. Cheers.

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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Old 09-19-2014, 09:46 PM   #67
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I love my 3.73s I have a auto ;p

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Old 09-19-2014, 09:48 PM   #68
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3.73 or 4.10?

Quote:
Originally Posted by FastFord13 View Post
all manuals.

You completely missed the point.

OP has an auto, looking at the comparisons anything higher than 3.73 will be monster gearing.

You are talking about a completely different transmission. 3.73, possibly a little higher is perfect for the manuals.

Yes it is the same engine being used, but you need to isolate the gearing to find out what is best for the car.

The reason there is the old saying of 3.73 for manual and 4.10 for auto is back in the SN95 when the auto had numerically lower transmission gearing than the manual, which meant that it benefitted from the numerically higher rear end gear. It is completely the opposite with the newer Mustangs. The autos now have numerically higher transmission gearing and will benefit from a numerically lower rear end gear.

Also, there is a difference from feeling faster to actually being faster.

Example. The fastest Auto 5.0s run 3.15 gears, yes it is a V8 but they are still just as high revving and get all their power up top like the 3.7. There is actual evidence that a higher gearing feels much faster, but then track times and actual races show differently.


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Old 09-19-2014, 11:59 PM   #69
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The dead horse is alive!

4.10's auto, 3.73's manual. Done.
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Old 09-20-2014, 07:23 AM   #70
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I have 3:73 gears for my 3.7 auto and love them. Perfect blend of gearing for street and or track use, city and or highway use.

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