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Old 12-03-2015, 05:40 PM   #1
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Best V6 gear ratio for racing?

Hey guys I'm at stock 2.73 stock ratio. I need to be faster as the mods I've bought don't really seem to be helping my take off. Anyone know what gear ratio is best? I'm leaning toward 3.73. Give me your opinions!!!


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Old 12-03-2015, 06:07 PM   #2
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I got 3.55s for mine will be putting them in before spring If you drive it daily the 3.55 s might be a good choice for you.
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Old 12-03-2015, 06:14 PM   #3
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I got 3.55s for mine will be putting them in before spring If you drive it daily the 3.55 s might be a good choice for you.

What is the difference? What do they do?


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Old 12-03-2015, 06:22 PM   #4
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I drive it daily lol. But I also wanna go fast.


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Old 12-03-2015, 06:29 PM   #5
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From what i read on here the 3.55s compared to the 2.73 which is what i have also is like nite and day difference in take off also and you'll still get decent gas mileage with them
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Old 12-03-2015, 06:33 PM   #6
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Go to the top of the 2011 2014 v6 thread ..guide to modifying your v6 that has alot of info on gears
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Old 12-03-2015, 06:34 PM   #7
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From what i read on here the 3.55s compared to the 2.73 which is what i have also is like nite and day difference in take off also and you'll still get decent gas mileage with them

How much are you paying for installation?


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Old 12-03-2015, 06:36 PM   #8
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350 for the install i got the ford racing gears and install kit also
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Old 12-03-2015, 06:42 PM   #9
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How much was the kit?


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Old 12-03-2015, 09:55 PM   #10
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What is the difference? What do they do?


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In brief, Low ratio gears such as 2.73 will allow you to go up to faster top speeds while Higher ratio such as 3.55 or 3.73 would be quicker at the lower speeds. Like say 0-60.
Follow this link to read up on it.
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Old 12-03-2015, 10:10 PM   #11
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4.10s and call it a day.


Pick your poison.
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Old 12-04-2015, 01:22 AM   #12
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If you like straight lines, the fastest NA 3.7s are all running 3.73 if it is a manual, and 4.10 if it is an auto.

If you like to turn, 3.31 is my recommendation. I am playing around with 3.15 and shorter tires, but no hard results (car keeps breaking, forcing me to drive other peoples cars).
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Old 12-04-2015, 12:19 PM   #13
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Depends on your type of racing. For autocross, I'd suggest 3.55:1. For bigger track, 3.73:1 (it's what I have). For drag racing, maybe 4.10:1?

My suggestion for autocross should mean you can go into second and be able to stay in that gear the whole course without having to worry about shifting. At my ratio, for the best times I do need to shift up to 3rd or I'm running it right past the red line (not good for poor my cyclone engine). When that happens, if you aren't rev limited, I believe the computer will at least shut you down before you overheat and blow something, but... anyway, 3.55:1 appears to be the sweet spot for Mustang autocross at least at the former Kart race track I go to for autocross.
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Old 12-04-2015, 06:10 PM   #14
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373's with a tune was a real wake up call for my 11 Stang! Everyday primary car....perhaps 331's.


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Old 12-05-2015, 02:55 AM   #15
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Do not get 4.10s. That is way too much gear IMO. Especially for a daily driver. The choice should be between 3.55s and 3.73s. I got 3.55s and love them for a daily.
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Old 12-05-2015, 06:04 AM   #16
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mine has 3.31...I don't do alot of hwy...3rd gear tops out around 85/90 but doesn't start to move until 25/30. I would like it to start earlier and end lower and if I could I would go 3.73 which is a 10-12% shift lower.
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Old 12-05-2015, 07:12 AM   #17
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4.10 strip, 3.73 street.does yours have a 6 speed manual or is it an automatic?
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Old 12-05-2015, 12:37 PM   #18
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I've been running 3.73s for 2 years in a manual as a daily, couldn't be happier.

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Old 12-05-2015, 03:20 PM   #19
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Originally Posted by fast ford
running 3.73s for 2 years ,couldn't be happier.
Do you have the stock drive shaft as well? Have you lowered the car?
They may not be related but a buddy of mine on here had his DS snap on him shortly after installing 3.73s and an MPT tune. He is also an auto and after Muds cruise he and I had some nice hwy pulls. Even with a small 1/2 car lead I still passed him up and I'm a manual with 3.31s. Wanna go 3.73s but don't want my DS to crap out on me as its my DD
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Old 12-05-2015, 04:17 PM   #20
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Lowered on stock ds. Have hit 160km/h a few times.
If I start going to the track its something I'll consider but for now no complaints.
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Old 12-05-2015, 04:45 PM   #21
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I wouldn't think gear ratio would have anything to do with a drive shaft snapping... still same power going through the car.

But what do I know? I did change out my DS anyway, simply because I run tunes that remove limiters at the track and didn't want to take any chances.
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Old 12-05-2015, 04:49 PM   #22
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Could that be because of bad pinion angle?

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Old 12-05-2015, 05:54 PM   #23
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Its because of the higher Rpm you'll be running with a shorter gear compared to the stock 2.73s.
Pinion angle is more forgiving with the two piece ds as opposed to the one piece.
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Old 12-05-2015, 06:18 PM   #24
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I've had 3.31's, 3.73's and now 4.10's. If your auto 4.10s are perfectly fine for a daily driver even turning 2400-2600 rpms it's perfectly fine on the interstate. I suppose if you had a loud exhaust or drone in that rpm range it could be annoying. I've got MPT tuned with 4.10's with the street shifting and it feels great. I had the race shift when I had 3.73's and it was a bit much on the 1-2 shift, really annoying and why I chose the street shift with 4.10's.
All this talk about 4.10's are to much is by people who never even had them on there Cyclone. Like I said I've had all 3 I listed above, 4.10's are perfectly manageable with daily driving. Of course you need better tires if your going to stomp the pedal to the floor at every stop. I'm still using 255/40-19's, they only spin if I make them spin via the gas pedal.
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Old 12-05-2015, 06:26 PM   #25
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As far as driveshaft concerns.
3.73 gears is a 136.6% increase in driveshaft speed over the 2.73 gears. So if design speed limit was 115 mph you would be hitting it at 85 mph with the 3.73's. That doesn't mean the shaft will break but it's approaching the danger zone.
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Old 12-05-2015, 07:14 PM   #26
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I've got the six speed auto with 3:55 and a MPT 93 performance tune along with a few other mods and it really made my 3.7 come alive . Gas milage is still really good also.


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Old 12-05-2015, 07:27 PM   #27
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Originally Posted by asvpedwin View Post
What is the difference? What do they do?


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Lower gears (Numerically higher numbers) multiply engine torque by more and get you into your powerband faster. For the rear gears the ratio is the number of driveshaft rotations to one wheel rotation of the wheels. I.e., 2.73 have the driveshaft rotate 2.73 times before the wheels themselves rotate once
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Old 12-05-2015, 07:34 PM   #28
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I drive it daily lol. But I also wanna go fast.


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An important question is if it's a manual or auto and if you drive on the highway very often.

If MPG isn't a problem for you, I'd suggest 4.10's, though there maybe be 4.55's for the 11-14 Mustangs. For me, 4.10's were the highest ratio I could find off AM for my New Edge.

You'll go through gears faster with both, and with a manual, some say it makes 1st gear too short, though you can use 5th in the city. For those that can now use 5th in the city, the difference in MPG is negligible and they may gain MPG in the city.

Again, if you commute by highway daily, you'll want a more moderate gear, probably 3.55's or 3.73's. There are a lot of things to take into consideration
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Old 12-05-2015, 09:20 PM   #29
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Lowered on stock ds. Have hit 160km/h a few times.
If I start going to the track its something I'll consider but for now no complaints.
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Good to know! OP, get the 3.73
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Old 12-05-2015, 09:26 PM   #30
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As far as driveshaft concerns.
3.73 gears is a 136.6% increase in driveshaft speed over the 2.73 gears. So if design speed limit was 115 mph you would be hitting it at 85 mph with the 3.73's. That doesn't mean the shaft will break but it's approaching the danger zone.
Diehard, what if the speed was 125 with 2.73 what would it be with 3.73s?
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Old 12-05-2015, 09:59 PM   #31
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Diehard, what if the speed was 125 with 2.73 what would it be with 3.73s?
Assuming tire diameter and rpm was the same, 2.73 is like 27% longer than 3.73, so take 73% of that speed, or about 91.25 mph.
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Old 12-06-2015, 01:18 AM   #32
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Thanks guys for all he responses!! And btw I just tuned the car and I'm spinning like crazy!!!!! Anyone know any tips? I'm launching at 2.5 and it still spins, I know it's because of the tune


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Old 12-06-2015, 01:30 AM   #33
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I love getting into the twisties with my 4.10's and all my shift points at 3k-3500. I always have power and ready to come out of the turns burning. Not so good on CA highways tho lol. 70mph = 2700rpm. 80mph = 3k rpm. Average ~ 26 mpg on long trips and 15.5 mpg around town.
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Old 12-06-2015, 10:05 AM   #34
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Thanks guys for all he responses!! And btw I just tuned the car and I'm spinning like crazy!!!!! Anyone know any tips? I'm launching at 2.5 and it still spins, I know it's because of the tune


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A nice set of lower control arms should help out. Also, a stickier tire.
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Old 12-07-2015, 11:10 PM   #35
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A nice set of lower control arms should help out. Also, a stickier tire.
Relocation brackets too. Puts the LCA positions in a better place
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