Is it worth upgrading to 3.73s from 3.31s? - Mustang Evolution

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Old 03-16-2014, 11:43 AM   #1
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Is it worth upgrading to 3.73s from 3.31s?

My Mustang came with the V6 Performance Package, so it had 3.31s right from the factory. I've been toying with the idea of upgrading to 3.73 gears. However I've heard horror stories of dealers charging people up to $800 to install them. My question is it worth the money to upgrade? How big of a difference would I see in terms of acceleration?
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Old 03-16-2014, 12:14 PM   #2
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What are your intentions? If it's street driving leave it alone. A 75 shot might be fun. Your call. With your first gear you don't need gears unless your racing with a tire.
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Old 03-16-2014, 12:15 PM   #3
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Dont go to a dealer to install them. I just went from 3.31 to 4.10 in my coyote

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Old 03-16-2014, 12:32 PM   #4
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Dont go to a dealer to install them. I just went from 3.31 to 4.10 in my coyote

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Y not a dealer ? Price ?
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Old 03-16-2014, 12:32 PM   #5
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Yes price

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Old 03-16-2014, 12:35 PM   #6
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Even if I can get them installed elsewhere for cheaper would I really feel any major difference in how fast I accelerate or should I just stick with the 3.31s?
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Old 03-16-2014, 12:37 PM   #7
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Yes you will see a big diff.

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Old 03-16-2014, 12:42 PM   #8
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Dont go to a dealer to install them. I just went from 3.31 to 4.10 in my coyote

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Other coyote owners tell me 4.10 is too much?


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Old 03-16-2014, 12:43 PM   #9
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Depends on what you consider to much.

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Old 03-16-2014, 12:48 PM   #10
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Run a 28" tire at the track. Redline in 8100 and your fine.

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Old 03-17-2014, 02:42 PM   #11
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As with any gear change, what is your type of driving style? Are you a street, stop/go kind of driver, looking for the best "out of the hole" launch? Or are you more a highway driver looking for top speed? The higher the gear ratio, the better the launch, but top speed will suffer.

Thats why some go the route of 3:55's to 3:73's as a happy medium between street and highway type driving speeds.
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Old 03-17-2014, 06:21 PM   #12
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Rap, do you have an auto? Because I heard 4.10s on a manual 5.0 makes first gear worthless
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Old 03-17-2014, 07:04 PM   #13
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Rap, do you have an auto? Because I heard 4.10s on a manual 5.0 makes first gear worthless
No its a manual.

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Old 03-18-2014, 01:15 PM   #14
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As with any gear change, what is your type of driving style? Are you a street, stop/go kind of driver, looking for the best "out of the hole" launch? Or are you more a highway driver looking for top speed? The higher the gear ratio, the better the launch, but top speed will suffer.

Thats why some go the route of 3:55's to 3:73's as a happy medium between street and highway type driving speeds.
I have a 07 automatic GT with minimal upgrades. I do have a tuner and actually had a tune made on the Dyno for 93 octane, but the main gripe I have is that I can't spin the tires by just stomping on the gas (and yes, I have the traction control off). Will upgrading from 3:31s to 3:73s possibly change this?

I drive 95% of the time in the city in stop and go traffic (and I tend to drive a "little" agressively). The other 5% is on the highway, but when on the highway I will generally be driving for 4 -8 hours and a lot of the time will drive 80 mph during these trips. If the 3:73s do allow me to spin the tires, will it make a huge change to my highway driving (will it be revving unbearably high)?
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Old 03-18-2014, 06:14 PM   #15
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I went from my factory 3.31's to 3.73's. Big difference in a 'good' way. I also had my dealer do the install. Worth the extra $$$ (i think $550 for labor only) just for peace of mind. Gears are nice and quiet. This is the only mod i have paid someone else to do to my Mustang.
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Old 03-18-2014, 06:35 PM   #16
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I have the factory 3.55's and was thinking about 3.73's or 3.90's.. Worth doing or a worthless up grade from the 3.55's ??
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Old 03-19-2014, 07:27 AM   #17
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I have the factory 3.55's and was thinking about 3.73's or 3.90's.. Worth doing or a worthless up grade from the 3.55's ??
Might be worth it if you know a good and 'cheap' gear installer. I would have gone with 3.90 gears if 'Ford Racing' sold that ratio.
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Old 03-19-2014, 07:55 AM   #18
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Might be worth it if you know a good and 'cheap' gear installer. I would have gone with 3.90 gears if 'Ford Racing' sold that ratio.
The car had 3.55's in it when i bought it. Was just thinking about putting 3.73 or 3.90's in it. but if there will be a very minimal difference then it may not be worth it.
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Old 03-19-2014, 09:56 AM   #19
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The car had 3.55's in it when i bought it. Was just thinking about putting 3.73 or 3.90's in it. but if there will be a very minimal difference then it may not be worth it.
It will be more than a minimal difference. I went from 3.31 to 4.10.

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Old 03-19-2014, 09:59 AM   #20
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It will be more than a minimal difference. I went from 3.31 to 4.10.

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Thank you, i just wasnt sure because they semmed so close.. I'm sure 3.31 to 4.10's was a hugh difference.
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Old 03-19-2014, 10:01 AM   #21
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3.55 to 3.73 or 3.90 will be a good difference also.

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Old 03-19-2014, 10:04 AM   #22
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Can anyone tell me about what RPM i would be running at 70 mph in 6th gear with the 3.73 and the 3.90's? I run around 2000 now with the 3.55's. Just curious.
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Old 03-19-2014, 10:09 AM   #23
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3.73.

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Old 03-19-2014, 10:10 AM   #24
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3.90

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Old 03-19-2014, 10:11 AM   #25
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3.90

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hey, im not worried about a few hundred RPM.. Sounds good to me. Thank you for the info.
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Old 03-19-2014, 11:01 AM   #26
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Quote:
Originally Posted by 07GTCSvert View Post
I have a 07 automatic GT with minimal upgrades. I do have a tuner and actually had a tune made on the Dyno for 93 octane, but the main gripe I have is that I can't spin the tires by just stomping on the gas (and yes, I have the traction control off). Will upgrading from 3:31s to 3:73s possibly change this?

I drive 95% of the time in the city in stop and go traffic (and I tend to drive a "little" agressively). The other 5% is on the highway, but when on the highway I will generally be driving for 4 -8 hours and a lot of the time will drive 80 mph during these trips. If the 3:73s do allow me to spin the tires, will it make a huge change to my highway driving (will it be revving unbearably high)?
Some have stated that the taller gears you are considering will raise the RPM of highway speeds around 400 RPM. I would not call that "huge", but enough for me to stick with the 3:31's I have, because my driving is a 180 flip from yours; mostly highway for me.
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