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Ford Performance Ring Gear and Pinion Kit - 3.73 Gears (10-14 GT)

Market Price $164.99 You Save 9% ($15.02)
Our Price

$149.97

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  • Item 24001G11
  • MPN# M-4209-F373N

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Features & Details

  • Ford Racing Quality
  • Strong Forged Construction
  • 3.73 Gear Ratio
  • 8.8" Ring Gear Diameter
  • For Street or Track Use
  • Fits 2010-2014 GT and 2010-2014 GT500 Mustangs
Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

Superior Quality. These Ford Racing 3.73 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.

Application. This Ford Racing Ring and Pinion Gear set will fit 11-14 Mustang GTs and 11-12 Shelby GT500s. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.

Technical Note. Installation costs will vary, but a good rule of thumb is between $250 and $300. Be sure to work with a reliable shop that you trust for installations. You can also save money on your installation labor by having your Trac-Lok rebuilt at the same time as your gears are installed, see drop down option above.

Fitment: 2010 2011 2012 2013 2014 Details

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
Installation Info
Tech Specs

Approximate RPM for 2011+ GT


Manual
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 4210 5894        
2 2795 3913 5031 6149    
3 1944 2722 3499 4277 5054 5832
4 1518 2126 2733 3340 3948 4555
5 1150 1610 2070 2531 2991 3451
6 748 1047 1346 1645 1944 2243

Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 4798 6717        
2 2692 3768 4845 5922 6998  
3 1750 2449 3149 3849 4549 5249
4 1315 1841 2367 2892 3418 3944
5 997 1396 1795 2194 2593 2992
6 795 1113 1431 1749 2067 2384
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 10, 11, 12, 13, 14
  • GT500 - 10, 11, 12, 13, 14

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
A++

I recomended. It is a good combination between 3.73 gear and the new generation 5.0 engine with a 6 speed automatic transmision.

Helpful (8)

5/5
Now I feel the car is awake

So my 2013 GT GB Premium came with the bone stock 3.31 LS Gear ratio of 3.31. Tis ok for hwy, fuel economy driving, but fuel economy and MUSTANG should not be in the same sentence. So one of the first ...

Read More
Helpful (7)

Overall Rating 4.9 out of 5 stars
Read All 57 Reviews

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15 Questions / 7 Answers

Ask a Question

What add-ons are necessary to buy along with the gears if they are going to be professionally installed?

DeHa

  • Hello! The Motive Rear End Installation and Bearing Kit has everything you need to install the Ford Performance 3.73 Gears Motive Rear End Installation and Bearing Kit - 8.8 in http://www.americanmuscle.com/rearendrebuild.html

    VincentV

Helpful (1)

Do they whine or howl? Please don't tell me that it's all in the install. That's not always true. If you have howling or a whine, I'd like to hear about it.

Dj1123

  • Just had the 3.73 gears professionally installed on my 2012 GT w/automatic. No howling or whine...None!

    Paladin

Show 1 more answer Helpful (1)

I am looking at replacing the stock gearing on my 2012 V6 Mustang and am trying to figure out which size would be best. Best being a good amount of performance add without killing gas mileage too badly. I've heard the 3.73 is the most popular but is that "best" for V6's or just GT's? I use my stang for mostly highway speed commuting and looking forward to some track days.

KurtG

  • 3.73 gears. such as the Ford Performance 3.73 Gears are a common reccomendation, as they give a good blend of the acceleration of 4.10's and the fuel mileage and and lower highway cruise RPM of 3.55's. For a daily driver that see's a lot of highway use, a 3.73 would be perfect.

    Rob D

Helpful (0)

Will you please explain what the different gear ratios mean for performance in my 2011 GT with 3.73 gear ratio.

JerryL

  • Considering that lower gears provide greater torque multiplication, they require more input speed (engine rpm) to produce the same output speed (tire rpm). Higher gears multiply torque less, but they require less input speed to deliver the same output speed. Higher gears will reduce engine rpm versus road speed where lower gears will do the opposite. Another way to look at it is that the car will go faster at the engine’s rpm limit than it would with lower gears and the exact opposite could be said for lower gears.

    AMJEFF

Helpful (0)

I inquired at a Ford dealership about having these 3.73s installed in a 2014 Mustang GT that has a factory 3.31 ratio. In addition to a substantial bill for labor, I was advised that I could only upgrade to the 3.55s. Can anyone lend any insight on this. I assumed that 3.73s would fit into the same housing as the 3.31s. Maybe it's a warranty issue?

andrewd

  • You are able to upgrade your gears to 3.73 without having to change the differential housing.

    KevinD92

Helpful (0)

I put 3.73 in my 2014 mustang gt automatic and they whine like crazy when I let off the gas. They whine a little under acceleration but very little.We tried all kinds of different shim on the pinion and the ring also. Gears feel tight when turn the ring gear by hand but there is slack on the pinion. A friend of mine had this issue and replaced 3.73 with 3.55 and the noise went away..any idea?

Waistedmymoney

  • With installing new gears you will have a 500-1000 mile easy drive break in period for the gears. Within this timeframe, new gears would be known for making some sounds. If the sound persists we would recommend giving us a call in for guidance. http://www.americanmuscle.com/contact.html

    Ricky36

Helpful (0)

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Customer Reviews (57) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.7 4.7
  • Fit 4.95 5.0



  • 5/5

    January 27, 2012

    A++

    I recomended. It is a good combination between 3.73 gear and the new generation 5.0 engine with a 6 speed automatic transmision.

    Rod71

    Year: 2011 Submodel: GT Lajas, Puerto Rico

    Helpful (8)

  • 5/5

    Installation Time: Full Day

    April 23, 2013

    Now I feel the car is awake

    So my 2013 GT GB Premium came with the bone stock 3.31 LS Gear ratio of 3.31. Tis ok for hwy, fuel economy driving, but fuel economy and MUSTANG should not be in the same sentence. So one of the first mods I did was yank the 3.31s and ordered these beasts. No the experienced modders will tell ya 4.10s are the way to go, but if you're not use to a car with a lot of grab and hook up, it is best to go from 3.31s to 3.73s. If you want to save some money on gas you could go for 3.55s, respectable gear, but for those of us who want to unleash the beast under the hood... Well, the 3.73 is a great gear for the track and just normal day to day driving. Gear install is about a day, even for the hard core mechanic. It is FORD PART some Ford Racing warranties the item. If you have a new car like I do the rebuild kit is not needed, but if you're doing the switch on a car with 40k+ on the odometer get the rebuild kit and use it. With these gears and a BAMA Performance tune you will feel like you are in a brand new car. Make sure you do use Friction modifier when mixing in the Gear Oil. Also of note, you will need at tuner to reset the axle ratio in the vehicle. No more little speedo gears to change it is all based on a tune. Worth every penny. Cost os parts and install will run you about $600.00 (the $200-$300 price AM feels it should cost must be someone charging $50 labor. Figure the install to be between $375 and $475.

    TheMasterofFunkness

    Year: 2013 Submodel: GT Philly

    Helpful (7)

  • 5/5

    January 14, 2011

    THE BEST

    i was trying to decide to go 3.73 or 4.10 but 4.10 will be to much. i went for 3.73 and got them installed at a profesional shop at houston performance and woooooow big difference, i love the way my 5.0l 94 stang, pulls now 2nd 3rd and 4th even 5th gear feels like 3rd going at 40 or 50 mph very pleased. if u are thinking about 4.10 and 3.73 go for 3.73 u wouldnt regret it. i recommend

    sergio fernandez

    Year: 1994

    Helpful (7)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    November 23, 2012

    Ford Racing 3.73 gears

    Sure you can get a cold air intake,tuner and throttle body but the biggest seat of the pants gain you will get will come from gears. My '12 GT came with 3.31's from the factory which are good for gas mileage but swapping them out for 3.73's made a huge difference! To me,3.73's are the perfect mix for decent gas mileage and all out performance. The car isin't screaming down the highway either. I would definitely recomend this to anyone with 3.31's that are looking for a relatively affordable performance mod.

    Davekonabluegt

    Year: 2012 Submodel: GT Severn, MD, USA

    Helpful (6)

  • 5/5

    February 21, 2011

    pretty good gears

    Meh, they are ok, I should have gone with 4:10's but they will do for now, acceleration did increase, but I was expecting a little more ooomph

    Omar

    Helpful (4)

  • 2/5

    November 02, 2010

    Bad Alignment

    The gears appeared to be well manufactured, but after trying 24 shims to 56 shims in order to get them to align properly, it was evident that they would never work without producing whine or chipping teeth. I have also installed 3.90 gears on another Mustang with no problem whatsoever; I'm buying Motive gears tomorrow because I trust them a good bit more. I recommend not buying these gears unless you know of some way to keep the teeth from not chipping when the gears will only align at the outside rim. I personally don't feel comfortable with the cruddy alignment I had. Also, beware of putting the gears on your car. Just by rotating the gears after putting them in my gear box to see the wear pattern in the paint, I voided my ability to get a refund from AM. I've had other good products from AM, but unfortunately, this isn't one. I recommend Motive.

    Jesse

    Helpful (4)

  • 5/5

    May 28, 2010

    3.73 2008 GT

    What gear do I get? That is the question burning through your mind, dear reader. I have not had a 4.10 in my car but putting in the 3.73 is with out a doubt a perfect match! The car is tighter on the pick up and it goes like stink! When you want it to be tame it will do that too. RPM increase at 60 mph is only about 200 RPM. Very little loss for a very big gain! I had mine installed by a good mechanic and that ran me a little over $300. A perfectly balanced gear.

    Douglas Kirk

    Year: 2008 Submodel: GT

    Helpful (4)

  • 5/5

    August 05, 2011

    So far so good

    These gears have made my car wake up. I changed over from 3.31 to 3.73 and I can tell there is a pretty big difference. I did other mods at the same time so still waiting to tell what it did to the MPG.

    Jason

    Year: 2011 Submodel: GT

    Helpful (3)

  • 5/5

    October 13, 2010

    Good buy for any guy (or gal)

    Bought gears, install kit, and girdle a few weeks ago and had them professionally installed. Very happy with the gears and how well my car pulls now. If you want to make your car a little quicker without major cash, these gears are an excellent choice.

    Tracy

    Helpful (3)

  • 5/5

    March 12, 2010

    ford racing 3.73 gears

    great gears. I would strongly recommend them for anyone trying to get a little more pep for their mustang. Very good quality for the amount you pay. Would buy again.

    jesus arroyo

    Helpful (3)

  • 5/5

    February 02, 2010

    sweet

    been about 500 miles since i got mine installed and it's great. i went ahead and bought the trac loc and bearing kit along with the royal purple gear oil and what a difference. all gears pull harder, especially 3rd!!!

    david monroe

    Helpful (3)

  • 5/5

    July 21, 2009

    Awesome!

    Finally installed my 3.73s- wish I had done it sooner. Good luck trying to shift to third- the g-forces will keep you VERY well planted!

    Jay

    Helpful (3)

  • 5/5

    March 02, 2009

    Gearsssss

    I raced a mustang with 4.10\'s with the 3.73\'s and let me tell you that these gears PULL. period.

    Johny

    Helpful (3)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    November 15, 2013

    DO YOUR HOMEWORK

    Do your homework on rear gears, I personally have a 2010 GT Manual.. because of this, I have 3.55s stock, I thought that I had 3.31s; so my gear change was very minimal and I kind of wish I hadn't feared the gear and went for 4.10s Gears are great though, No whine or any noise and they make shifting slightly smoother. Keep in mind the install is not very cheap, and very hard to do at home, roughly 80 n hour shop fee for a "4 hour" job... I do recommend them though, Good Luck!

    Zachjones

    Year: 2010 Submodel: GT Daytona, fl

    Helpful (2)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    July 01, 2013

    Acceleration you can feel!

    Had a problem with the first set of gears, they were cut in a way that they were noisy even install to the exact specs from FRPP. AM got me a replacement set out and all is well now. If you have never installed gears before do yourself (and your wallet) a favor and get them installed professionally! Specifically somewhere that knows how to install Ford gears without a whine and stand by their install if they do. I lost a couple mpg on the highway but the gains are pretty nice, especially with the Hurst short-throw shifter.

    Chris2010GT

    Year: 2010 Submodel: GT Bentonville, AR, USA

    Helpful (2)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    April 14, 2013

    They Help

    They aren't bad def. Make a differance on 60foot times. I was hoping for a little more oomph from them but, again there are noticeable gains. The car doesn't seem to struggle as much off the line and climbs through the gears faster. I lost 5mpgs on the highway but gained about 3 in the city, now I get about 21mpg be it highway or city driving.would I recommend yes, if just for the track 4.10s if u daily drive I would say no lower than these to keep some effeciancy.

    2010rustang

    Year: 2010 Submodel: GT TEXAS USA

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 14, 2012

    Gears

    Best gears for coyote mustang, if you plan a supercharger for the future. Pulls hard! 4.10 recommended for non supercharged mustangs for top end power!

    09gt

    Year: 2012 Submodel: GT Rowland heights, California

    Helpful (2)

  • 5/5

    December 10, 2009

    SPEED

    talk about giving ur stang some MPH in a hurry i feel the diff it made when i drive it love it

    Ryan

    Helpful (2)

  • 5/5

    July 18, 2009

    FRPP 3.73

    These gears are perfect for my combo, they now sit behind a 450+hp engine and holding fine.

    Jeff Bailey

    Helpful (2)

  • 5/5

    Installation Time: Full Day

    August 01, 2014

    Best Bang for you Buck!!

    I ordered these 3.73 Gears for my 10 GT Premium. I have FRPP Hotrod Cams, an Airaid CAI, Custom 3'' Exhaust and a iTSX Bama Performance Tune. My GT is an automatic (adjusted shift points) and these 3.73 gears really woke her up!! The torque is soooo much better then before. I had Royal Purple Max Gear oil added when the gears where replaced and the shifts are way smoother!!. Honestly these are probably the biggest difference maker and best bang for your buck out of all the "normal" bolt on upgrades you can have done. It just feels like a completely different car!! I had a local performance shop that specializes in Mustangs do the install and they charged 225.00 for the install (10% off for military) and 73.00 for the required pinion bearing race kit. Overall cost was $301.36. The install perfect and without a hitch, absolutely NO winding. NOTE: A tune is REQUIRED to be loaded before you can even test the car after install. Bama Performance had my custom tune emailed out within 2 days of purchase and the load with my iTSX tuner was super easy. AM had my gears mailed out next day. I can't say enough about AM...By far the BEST Mustang Performance company in the world!! ALL my upgrades have been purchased through AM and I've never had an issue with anything I've bought....Buy these gears if you looking for the best bolt on upgrade you can buy for under 500 bucks total!!

    MustangGT10

    Year: 2010 Submodel: GT Athens, GA, USA

    Helpful (1)

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