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Ford Performance 3.73 Gears (10-14 GT)

54 Reviews
Our Price


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

  • Market Price $173.99
  • You Save 17% ($29.01)
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Customer Photos
  • 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

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

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

Most Helpful Reviews

Awesome Product!

Once installed, my car is a total beast now. This should be the first mod for anyone looking to wake their car up. You will feel the difference, guaranteed!

Helpful (1)


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

Helpful (2)

Overall Rating 4.9 out of 5 stars
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9 Questions / 13 Answers

Ask a Question

Highway mpg diff between 3.55 and 3.73 in 10' gt manual. i do a lot of highway driving and want to upgrade my gears. I would like to put the 3.73. But if the mpg is a big difference between them and the 3.55. then i may have to go with the 3.55


  • I had a 09gt with 4.10s not good for 5 speed. 3.73 will do perfect! It will pull real nice


    Good Answer (1) (0)

Show 2 more answers Question Resolved

What is included in the install kit? If I'll get the gears installed professionally, do I only need to order the Gears and the 8.8 bearing?


  • yes, the kit only contains the gears you'll need the pinion bearing/seal separate


    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

What gears are better for my 2012 GT automatic? Do not know which gears to get for my car,3.73 or 4.10


  • For both automatic and manual transmissions, we recommend the 4.10 gears for the 6-speed Mustangs! However, you can't go wrong with either gear set to be perfectly honest! There is very minimal difference in MPG loss between the 3.73 and 4.10 and the 4.10s will get you going faster, faster! As many people say, don't fear the gear!


    Good Answer (3) (4)

Show 1 more answer Question Resolved

Differential cover? I had these gears installed a few weeks ago, and i love them! i was just wondering if its necessary to replace the differential cover when installing new gears? should i replace it when im changing out the fluid after 500 miles? Anyone run new gears without an aftermarket cover for a long period of time? Thanks in advance


  • I put 3.73's on my car and did not replace the diff cover. Have not had a problem. I have 2,000 miles since making the change.


    Good Answer (1) (0)

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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.


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


    Good Answer (4) (0)

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Computer Change Required? Hi AM, Does the computer need changed after install on a 2013 5.0 automatic transmission...shift points? I saw "Girls Garage" on Velocity this weekend and they installed your kit that had a programmer included, can you quote me this kit? Thanks, David


  • Yes, you will need your speedometer recalibrated for the new gear ratio. Please give us a call and we'd be happy to assist you with pricing and any other questions you may have!


    Good Answer (1) (0)

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Customer Reviews (54) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.705883 4.7
  • Fit 4.941176 4.9

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    November 15, 2013


    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!


    Year: 2010 Submodel: GT Daytona, fl

    Helpful (2) (0)

  • 5/5

    March 02, 2009


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


    Helpful (2) (0)

  • 5/5

    September 22, 2007

    Awesome Product!

    Once installed, my car is a total beast now. This should be the first mod for anyone looking to wake their car up. You will feel the difference, guaranteed!


    Helpful (1) (0)

  • 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.


    Helpful (3) (1)

  • 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) (1)

  • 5/5

    January 27, 2012


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


    Year: 2011 Submodel: GT Lajas, Puerto Rico

    Helpful (7) (0)

  • 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.


    Year: 2013 Submodel: GT Philly

    Helpful (6) (0)

  • 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.


    Year: 2012 Submodel: GT Severn, MD, USA

    Helpful (5) (0)

  • 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.


    Year: 2011 Submodel: GT

    Helpful (3) (0)

  • 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.


    Helpful (4) (3)

  • 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.


    Year: 2010 Submodel: GT TEXAS USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 14, 2012


    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!


    Year: 2012 Submodel: GT Rowland heights, California

    Helpful (2) (0)

  • 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 (2) (0)

  • 5/5

    February 02, 2010


    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 (2) (0)

  • 5/5

    December 10, 2009


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


    Helpful (2) (0)

  • 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) (0)

  • 5/5

    January 14, 2011


    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 (5) (3)

  • 5/5

    July 21, 2009


    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!


    Helpful (3) (1)

  • 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!!


    Year: 2010 Submodel: GT Athens, GA, USA

    Helpful (1) (0)

  • 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.


    Year: 2010 Submodel: GT Bentonville, AR, USA

    Helpful (2) (1)

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