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Ford Performance 3.73 Gears and Install Kit (10-14 V8; 11-14 V6)

Market Price $316.99 You Save 12% ($37.00)
Our Price

$279.99

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  • Item 100573
  • MPN# 100573

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Features & Details

  • Money Saving Combo Kit
  • Ford Racing 3.73 Gears - 8.8"
  • Ford 8.8in Rear Gear Pinion Bearing
  • Motive 8.8" Rear End Installation and Bearing Kit
  • 1 Bottle of Ford Racing Friction Modifier
  • 2 Quarts of Royal Purple Max Gear 75w140 Gear Oil
  • Fits 2005-2014 V8 and 2011-2014 V6 Mustangs with 8.8" Solid Rear Axle
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. This Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

Complete Kit. This Ford Racing Gear and Installation Kit comes complete with all the components needed to swap out your ring and pinion gear. It includes Ring gear, Pinion gear, inner rear gear pinion bearing, 1 bottle of Friction Modifier, 2 bottles of 75w140 Gear Oil, gaskets, seals, shims, bearings and all the required hardware.

Legendary Ford Racing Quality. When you're adding performance parts to your Pony, you can't go wrong by installing parts from the folks that know it best. Ford Racing's legendary quality ensures years of hassle-free use.

Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Ford Racing Speedometer Recalibration Tool or a Bama SF4/X4 Power Flash Tuner is a quick and easy way to fix this issue.

Application. This Ford Racing 3.73 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs, including the 2005-2014 GT, Bullitt, BOSS, Shelby GT500 and 2011-2014 V6 models.

Application Note: Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

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
  • (1) Rear Gear Pinion Bearing
  • (1) 3.8 fluid oz bottle of Friction Modifier
  • (2) one quart bottle of Royal Purple Max Gear 75w140 Gear Oil
  • Front & Rear Pinion Bearing
  • Pinion Seal
  • Carrier Bearings
  • Carrier Shims
  • Differential Bearings
  • Crush Sleeve
  • Pinion Nut
  • Cover Gasket
  • Ring Gear Bolts
  • Brush
  • Gear Marking Compound
  • Loctite
Installation Info
Will it fit my Mustang?
  • GT - 10, 11, 12, 13, 14
  • GT500 - 10, 11, 12, 13, 14
  • V6 - 11, 12, 13, 14
  • Boss 302 - 12, 13

Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
What a difference

I've done everything to mod my car without putting a blower on it. This has been the most substantial upgrade as far as quickness. I immediately could tell the throttle response had improved. My stock ...

Read More
Helpful (4)

5/5
Very Nice Gear Set with Everything Required for the Install

I have a lightly modified 6 speed 2012 Mustang GT. All of the mods are bolt-ons; CAI, Long Tubes, Racing Cats, Higher Output COPs etc. My car was purchased off the lot and had all options except I was ...

Read More
Helpful (3)

Overall Rating 4.8 out of 5 stars
Read All 69 Reviews

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17 Questions / 6 Answers

Ask a Question

"Ford Performance 3.73 Gears and Install Kit (10-14 V8; 11-14 V6)." Hi, i bought these for my 14 v6, still in the box. I'm thinking about purchasing a 17 v6, will this gear kit fit in the 17 v6? Thx

peddler

  • This Ford Racing 3.73 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle models and will not work with the 15+ models due to the independent rear end.

    Ricky36

Helpful (1)

If I purchase this kit for a 2010 GT, do I still need to purchase the "Rear Gear Pinion Bearing" Item#394003? I remember seeing a video here on AM, and Steph said this would be necessary for the 2010 because the design had changed. Or is there a complete kit for the 2010's specifically?

bobpepr123

  • Hello! The Ford Performance 3.73 Gears and Install Kit will have everything necessary for your 2010 GT.

    VincentV

Helpful (1)

I am thinking about upgrading to this kit for my 2012 GT. It currently is running on a tune 24/7 because of my boss 302 intake and it is tuned for the stock 3.15 gears. I plan on having this done professionally, I will get a new tune for these 3.73 gears before i take it in. Should i tell the shop not to start the car until i have the new tune for these gears installed?

JJ

  • Naw it will be alright your speedo will be off by a few mph's that's all. If you have a manual car I would go 4.10 only if you don't drive it ever day with that 6 gear you almost can't tell. I got that in my car now and let me tell you it's amazing out of the gate......

    bill2014

Helpful (1)

Will this kit work for 2010 4.0 v6.

KevinR

  • A 2010 V6 had a 7.5" differential so this Ford Performance 3.73 Gears and Install Kit would not work as it is intended for an 8.8" differential.

    AMJEFF

Helpful (0)

if I were to install these gears would I need to get new axles as well or will stock axles work just as good?

KentR

  • The Stock axles will absolutely work with the Ford Performance 3.73 Gears and Install Kit without any issues.

    AMCoal

Helpful (0)

If I install these 3.73s, do I have to change the axles since I'm running on bigger gears?

Desertspeed

  • This Ford Performance 3.73 Gears and Install Kit does not require the use of different axles - they will work with the factory axles.

    AMJEFF

Helpful (0)

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Customer Reviews (69) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.8125 4.8
  • Fit 4.703125 4.7



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 10, 2016

    What a difference

    I've done everything to mod my car without putting a blower on it. This has been the most substantial upgrade as far as quickness. I immediately could tell the throttle response had improved. My stock Mustang lumbered off the line and then put you back in your seat around 4k rpm. This mod puts you back in your seat as soon as your foot touches the pedal. I'm afraid to turn my floor heater on because I'm afraid the stiff breeze will make me burn out. This upgrade made me realize I need to upgrade my tires. It's easy to get wheel spin now. It cost me $350 to have a differential shop install them and it took 4 hours. They used their own gear oil for $25 to save me money. At 500 miles I need to drain out the oil and refill it to get out all the debris and metal shavings anyway. So I saved the good stuff for my refill. I love it. Highly recommended.

    ZManOxnard

    Year: 2012 Submodel: V6

    Helpful (4)

  • 5/5

    Installation Time: Afternoon

    October 02, 2015

    Very Nice Gear Set with Everything Required for the Install

    I have a lightly modified 6 speed 2012 Mustang GT. All of the mods are bolt-ons; CAI, Long Tubes, Racing Cats, Higher Output COPs etc. My car was purchased off the lot and had all options except I was stuck with 3.31 economy gears. Although the car gets decent gas mileage on the highway, I bought this car for fun, not economy. After 9 or 10 trips to the dragstrip and some dyno time, it was obvious that I had one more mandatory modification; installing 3.73s. The ratio difference between the two is approximately 12, so mileage wise, it didn't have a significant effect on the highway mileage, but it allowed me to use most of 4th gear at the track. The difference between the 3.31 and the 3.73s is very noticeable. The car is quicker, and the RPM drop between gears is less, making my car much more fun on the street. Not a bad bang for the buck. Definitely recommended.

    15PSI

    Year: 2012 Submodel: GT Leesburg, VA

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 12, 2014

    Good bundle

    Just had these installed so im still breaking them in. As far as the kit itself the only thing it needs is another thing of oil because the two aren't enough. Other than that I'm in sixth gear at 38mph now haha. Must resist urge to floor it. Cost me about $450 to install in california.

    dbowman

    Year: 2011 Submodel: GT California, USA

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    July 11, 2017

    Totally different car now

    These 3.73 gears change the hole car. The car leaves so much faster and throws the rear end out a little in the 1-2 shift in the auto when accompanied with a Bama race tune. Would 100 recommend this product.

    BM3

    Year: 2014 Submodel: V6

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    September 13, 2015

    Couldn't be happier

    Should have done this mod a while ago. I couldn't be happier with what I got after having these gears installed. My car came equipped with factory 3.31 gears but after driving a 2014 GT owned by a friend equipped with 3.73 I absolutely had to have the gears changed out. I have driven older mustang (early 2000's) equipped with 4.10 and was undecided on which ratio to go with. Being the car is my daily driver I choose the 3.73's and they feel just right. They are a nice complete to my other mods. I choose to have the install done at a Ford dealer, as I happen to work in sales there, making it very convenient. Also I know the people who are working on my car and receive a discount on the labor. The total install amounted to about $600 prior to my discount.

    DTL77

    Year: 2013 Submodel: GT Moultonborough, NH

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    September 10, 2015

    13 Auto 5.0 is alive!!!!

    I went from 3:15 gears to this 3:73 and all I can say is wow! This gear really helped my automatic get off the line! If I had to do it all over this would have been my first upgrade. The installation kit comes with everything you need except about a half bottle of gear oil. Took me around 3.5 hrs to install. If you have an auto with 3:15s make the switch!

    pound

    Year: 2013 Submodel: GT Mississippi

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    August 05, 2015

    Automatic that drives like I would a manual

    Made the decision for this install after speaking with my mechanic and AM Customer Support person. While the purchase price was the best on the market for the full kit, the install was significant. I decided to add SR Performance Lower Control Arms since wheel hop is one of the anticipated results of this mod. Total install cost me $600 by transmission shop but, Ford wanted to charge between $850 and $900 just for the gear install so, I guess I can't complain. Anyway, after adding a new BAMA performance tune I am amazed at the results. Ran 120 mile roundtrip errand today and have to say THIS IS THE BEST MOD YET!! First, with the tune, my automatic transmission works like a dream. No lag. No running in 5th gear at 25 MPH. In fact, at highway cruising speed (70 MPH) it remains in 5th gear providing excellent acceleration without having to drive in manual mode. Not sure if this tune will allow it to get to 6th gear, unless driven manually since I didn't go over 70 due to my preference of allowing a comfortable break in. If I had a stick, I'd drive the way it does now. 1st to second gear shift doesn't happen until 1900 to 2000 RPM (as opposed to 1300 to 1400), Shifting is purposeful, obvious and sounds like a manual. At one point I went to manual mode to get to run in 6th. Will only need to do that going forward when my girlfriend is riding with me - LOL. This is a great mod!! Thank you American Muscle for your advice, great product and helping me make the best of my 380HP V6... On it's way to 400HP!! (P.S. A Tune or recalibration tool is a must!!! Without it, your speedo will read 55 when you're doing 40)

    Nicksmoak

    Year: 2013 Submodel: V6 Hawthorne, NJ

    Helpful (2)

  • 5/5

    January 28, 2014

    Quality product

    Still breaking them in... Nice improvement over the stock 3.31's...

    Tdbigt

    Year: 2013 Submodel: GT Denver, CO, USA

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    June 21, 2017

    MAKES ALL THE DIFFERENCE!!!

    I threw these in along with a cold air intake and a Bama tuner. The difference is HUGE! This is the way a GT should come from the factory! Makes me smile every time I get on it.

    JoshC

    Year: 2011 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    April 19, 2017

    Absolute best bang for your buck!!

    I bought these gears for my 2013 3.7 with a/t. After install these gears will make you think you're in a different car. Freeway driving in 6th gear I sit at about 2600rpms. If you are to buy these I would encourage you to also buy a one piece driveshaft. Install took me about 3.5 hrs with a buddy of mine. If you have never messed with your rear end I would have a shop install these.

    ChristianS

    Year: 2013 Submodel: V6

    Helpful (1)

  • 5/5

    July 22, 2016

    ASTOUNDING PERFORMANCE

    I bought these gears and installed them, and im amazed the amount of acceleration! I did have to get the SCT SF4 Tuner because it made my spedometer 20mph off, (already on my build list) but I tried these against several 5.0's and have been leaving them in the dust. I highly recommend these to anyone serious about improving their mustang. Good job AM

    Durkasdw

    Year: 2014 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 16, 2016

    Excited customer

    I purchased the Ford Racing 3.73 gears for my 2012 GT, best upgrade I have done to my car since I bought it.

    Brick1973

    Year: 2012 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 25, 2016

    Totally different car!

    First let me start off by saying this is an awesome product! Totally trasforms your car. Hooks harder than ever and pulls harder in the 100 and up ranges. Won't regret getting these!

    Hondu

    Year: 2014 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    September 21, 2015

    Awesome kit

    I have a 2012 GT with an automatic and stock 3.15 gears. After going back and forth between 3.73 and 4.10, I finally decided to go with the 3.73s and this install kit (44k miles on the car). The kit took about 3-4 hours to install, and I haven't had any issues after about a month of driving. Personally I am glad I didn't go with the 4.10s, because my mustang is a daily driver, and the 3.73s are the perfect combination of acceleration and gas mileage (about 1 mpg drop average). The difference is awesome, but to be honest, not as much as I thought it would be, which is fine. Still, getting on the gas from a stop is so much more fun now! Very happy with this purchase. I wish I got these gears sooner...

    AEpack2006

    Year: 2012 Submodel: GT NOVA

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    November 13, 2014

    Ford Gears with Install kit

    Internal Pinion bearing failed within 2 weeks. Shop that installed the kit showed me the bearing and race. The rollers were not making contact at the center of the rollers. Since I bought and brought the kit I had to pay to have the pinion bearing replaced which is the same cost as the initial install. Shop told me Ford pinion bearings are hit and miss. We installed a timkin but now that the gears have 600 miles on them I am stuck with a slight whine at certain mph's. Only fix is to buy and install new gears and pay for the install a third time. Do yourself a favor and buy a timkin pinion bearing and through the Ford bearing away.

    mtgldr

    Year: 2010 Submodel: GT GA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 15, 2014

    Feels like the car is pulling the road under it

    Definitely a huge upgrade from 2.73s but my fuel economy sure took a beating. Waiting for some revised tunes to come my way to try and help out in that area. As for the performance, it's a noticeable difference. It feels as if the car is pulling the road, sucking up every last bit of it that it can until I let my foot off. The install was not as easy as I originally thought it would be. I so not recommend tearing into the diff yourself unless you've done it before with great results. This ford rear end is nasty.

    TxMike2013

    Year: 2013 Submodel: V6 Tx

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    July 04, 2014

    Feel the power!

    Holy wow! That's all I have to say. This is the first thing I did in terms of performance mods for my stang and boy does it pack a punch. My car just takes off now! The throttle response was improved and you can feel the car pulling all the way through non stop. The only thing though is that it messes up the speedometer if you don't use a tuner. But once I get mine in on Monday, all will be well.

    Nadine53

    Year: 2012 Submodel: V6 Chicopee, MA

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    April 18, 2014

    the best mod to my mustang yet

    I have a bama tuner, cold air intake and flow master mufflers on 2012 mustang v6 but the car was sluggish off the line or at normal hwy driving after gear install the car has pull at low speed and continues to pull. The car feels like a MUSTANG now.

    doegermbj

    Year: 2012 Submodel: V6 san antonio texas

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    September 12, 2017

    Great product

    These gears are fantastic! The car pulls way harder and is much quicker off the line. The only downside is whenever I go above 90mph, the car starts to shake. Other than that, great purchase.

    Gilby

    Year: 2014 Submodel: V6

    Helpful (0)

  • 5/5

    June 29, 2017

    Worth the money!

    I've noticed a big difference in acceleration! I have off road x pipe,85mm throttle body, roush intake, res delete and tune and this paired perfectly. Definitely worth the money.

    Chris

    Year: 2013 Submodel: GT

    Helpful (0)

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