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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)
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$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?
    • Boss 302 - 12, 13
    • GT - 10, 11, 12, 13, 14
    • GT500 - 10, 11, 12, 13, 14
    • V6 - 11, 12, 13, 14

    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 (6)

    5/5
    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 ...

    Read More
    Helpful (6)

    Overall Rating 4.8 out of 5 stars
    Read All 71 Reviews

    Customer Photos (7) Submit Your Photo

    View All 7 Photos

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    19 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)

    Hi, I have Gt 2011 with stock gears 3.15 my question is wich one is better in drag racing from 0 KM , 40 KM , and 60 KM the 3.55 or 3.73 ? Thanks.

    AliF

    • The Ford Performance 3.73 Gears and Install Kit will be able to get you off the line much faster than the 3.55 gears will. However, the 3.55 gear ratio will keep pulling at higher speeds than the 3.73s for a longer stretch.

      Ricky36

    Helpful (0)

    Would i Need the whole install kit if i have 73k miles on my car?

    BossJr

    • We would recommend this Ford Performance 3.73 Gears and Install Kit when performing any gear change or refresh. With a higher mileage, using this entire kit as a refresh would be significantly beneficial to your differential.

      AMJEFF

    Helpful (0)

    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)

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    Customer Reviews (71) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.818182 4.8
    • Fit 4.712121 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 (6)

    • 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 (6)

    • 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 (5)

    • 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 (5)

    • 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 (4)

    • 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 (4)

    • 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 (3)

    • 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 (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      May 27, 2014

      3.73 are a bit extreme but awesome!

      3.73 are a bit extreme but awesome! I rarely use first gear now unless I am wanting to race someone, otherwise it is really short for stop and go driving. They totally changed the laid back feel of the car to a much more energetic and bold experience. I love them! Rpm is 6th at 70 is around 2400 rpm so fuel economy did drop on the freeway about 2mpg. Install was also pretty expensive with all the shimming involved. Don't forget the install kit!

      MrMiller14

      Year: 2014 Submodel: V6 Roseburg, OR, 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: $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 (2)

    • 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 (2)

    • 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 (2)

    • 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 (2)

    • 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 (2)

    • 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 (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

      Installation Time: Afternoon

      July 08, 2014

      must have

      I have upgraded my stang with exhaust lowering springs and everything you can do to a v6 engine with no supercharger but hands down the 3.73 gears are out of this world!!!!!!!! My stang is pushing 405 horsepower because of the upgrades I did but the gears really woke her up. If you dont have these get them it is such an improvement. Be sure to get a tune it really helps change the shift points it your stang is a automatic. Gas milage did go down some prob lost about a mile per gallon but who cares!!! American muscle is the bomb when it comes to aftermarket parts stop reading this and order the gears you will not be disappointed!!!!!!!!

      dollartree

      Year: 2011 Submodel: V6 murphy nc

      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)

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