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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, Video & 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

    Review & Installation Video

    Review & Install Video

    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.

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    20 Questions / 24 Answers

    Ask a Question

    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 (2)

    "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 can't find a shop in my area that will install this for a reasonable price. If I brought my car to you guys could you install it?

    TomB

    • Unfortunately we do not currently offer customer installs at this time. I would recommend checking with a Ford dealership as they should be able to do the install without any issues.

      AMJustinH

    Helpful (0)

    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)

    People Who Bought This Item Also Bought

    Customer Reviews (78) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.821918 4.8
    • Fit 4.712329 4.7



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      May 12, 2018

      One of the best mods!

      Highly recommend for that edge over others. The response is much quicker. That being said a few tips when getting them installed...1) You are going to need an additional quart of the royal purple oil to fill it correctly 2) do not forget there's a break in period that is recommended. You should drive for about 20-30 minutes then let it cool. And repeat the process several times before opening it up full throttle. 3) The speedometer will be off. Mine was 15mph faster than actual speed and I've seen others including mine become even more inaccurate the faster you go. Over all great product for the price!

      NathanC

      Year: 2014 Submodel: V6

      Helpful (2)

    • 1/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      May 10, 2018

      Graet addition

      Really woke up my v-6, the 3.73 gears and with my MPT tune the car pulls hard in every gear. Best addition yet.

      EverettH

      Year: 2012 Submodel: V6

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      April 27, 2018

      Gears

      Having a skilled background is needed to install, if you have one it’s only a couple hours to install. Performance gains are great for street or strip.

      JeffD

      Year: 2012 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 25, 2018

      373..! V6

      Best bang for your dollar this mod will keep you in your power band make the car alive and highly responsive

      S1972014

      Year: 2014 Submodel: V6

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      February 14, 2018

      Broke-back Gear...

      Went together like a clock, thanks Kevin for your compassionate and thorough assistance...jhf

      JohnF

      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      January 31, 2018

      Oustanding

      Absolutely made a difference on acceleration. Very pleased. Per the reviews, I bought the additional bottle of gear grease. Everything came out perfect. I don't even notice any MPG difference.

      Ryan

      Year: 2014 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      January 22, 2018

      good purchase

      received just what i ordered. customer sevice was very helpful

      AAndrew33

      Year: 2012 Submodel: V6

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      January 11, 2018

      3.73 Ford Performance Gears

      Installed in my 2014 GT/CS Convertible which came with 3.15 gears. Good mileage but sluggish off the line. Had Ford install some Ford Performance 3.73 rear gears. Wow what a difference. It woke my Automatic up. Shifts harder, grabs the road, and mileage suffered only a few mpg's. Love it.

      timber2417

      Year: 2014 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      January 07, 2018

      Must have MOD...

      My 2011 3.7 with 3:31s seemed lazy, but now with 3:73s it feels like I’m driving a more powerful car because there’s instant throttle response, power and she leaves much faster and throws her rear end out a little. It’s a blast to show off your torque at times. These gears compliment my automatic making smoother transitions between gears with less RPMs, and combined with shorty headers and Flowmasters instantly bring a big smile to my face! These gears will transform your 3.7 into a formidable street contender and you’ll have more fun than a roller coaster.

      DJMustang

      Year: 2011 Submodel: V6

      Helpful (5)

    • 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 (4)

    • 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 (6)

    • 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 (3)

    • 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 (4)

    • 5/5

      Installation Time: Full Day

      June 13, 2017

      Game changer

      You can definitely feel the improvement to your car! the gears wake up the mustang and really help you get through the gears. MPG will drop by 2-4 especially on the highway with 85 MPH being around 3k RPM in 6th gear. Power is totally worth the MPG drop if that's what you're going for. 250 for the kit and had a Ford tech friend install it for 180, amazing bang for your buck.

      Thomas

      Year: 2014 Submodel: V6

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      June 09, 2017

      Best upgrade

      In my opinion 3.73 are the best upgrade for the money , when installed properly these are nice and quiet and rpms didn't go up much at 70

      NikM

      Year: 2013 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Full Day

      June 08, 2017

      3.73 gears

      Well I had these installed Tuesday and picked up the following day. I spent about 600 on the labor. Can't really test these out yet as it's still in the break in period and have to heat cycle the gears. Can't wait to give them a go I've been hearing great things about them. It is a product worth getting.

      JosephA

      Year: 2011 Submodel: V6

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      June 03, 2017

      Worked great!

      I had a shop install this kit. After reading some of the other reviews they had mentioned there isn't enough oil in the kit, so I bought another bottle just in case. The shop used most of the 3rd bottle. I've definitely noticed a difference going from 3.31 to these gears. Since I'm still breaking them in I haven't really tested them out to there potential. I'm still waiting to do a few other mods to put the tune in to fix the speedo issue, but noticed its anywhere from 5-10 mph off depending on speed. Great product and I would recommend to anyone!

      DO

      Year: 2013 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Full Day

      April 25, 2017

      All there

      This kit was perfect, I had everything I needed to get the job done

      Nightmare

      Year: 2010 Submodel: GT

      Helpful (2)

    • 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.

      OxfordMach

      Year: 2013 Submodel: V6

      Helpful (5)

    • 5/5

      Installation Time: Afternoon

      April 07, 2017

      Woke up my car!

      Very happy I went with the 3.73 gears. (vs the 2.73's my car came with) My Stang was still slow off the line even after a new CAI, bigger throttle body, new exhaust, and tuner... but not anymore! These gears really make it much quicker, it actually jumps off the line now when you hit the gas! Like my other mods this is what should have come from the factory!

      JeffreyS

      Year: 2013 Submodel: V6

      Helpful (3)

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