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Ford Performance 3.55 Gears and Install Kit (10-14 V8; 11-14 V6)

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Market Price $316.99 You Save 12% ($37.00)
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$279.99 (kit)

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  • Item 100572

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Ship to: Ashburn - 20149
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    Features & Details

    • Money Saving Combo Kit
    • Ford Racing 3.55 Gears - 8.8"
    • Ford 8.8" 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 3.55 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

    MPN# 100572

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    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.

      Customer Photos (4) Submit Your Photo

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        Questions & Answers (15)

        5 Top Rated Questions

        i asked a question about the royal purple the rear end takes 3 quarts of oil and kit only includes 2 moderator stated with friction modifier it is 3 quarts, however 3.8 fl oz is not the equivelent to one quart so im assuming im going to be short gear oil?

        • The service fill on the Ford 8.8 Differential equipped in your Mustang will be 1.99 to 2.12 Quarts to achieve the correct fill level (5mm below the fill plug). With the 2 quarts of gear oil, and the friction modifier you should be able to complete the axle fill with no issues.

        Helpful (3)

        I have a 2014 V6 Mustang, and wanted to know what the 3.55 rear end will do for my car over the stock rear end? performance? power? Fuel economy? and I also have a tune for my vehicle will that help the rear end and where will it get me?

        • The performance gains and changes you may see when installing the Ford Performance 3.55 Gears and Install Kit would depend on your current set up! Please consult your tuner about the gains you may see since they already have your vehicle modifications or reach out to us directly with all your mods and we'd be happy to help you!Our contact information can be found here: https://www.americanmuscle.com/contact.html.

        Helpful (0)

        should I get 3.55 or 3.73s for street use with a cobra jet manifold?

        • 3.73s will offer you more torque without hurting the top speeds or MPG. This is a great ratio for street use.  

        Helpful (0)

        Does the fluid have to be changed after a certain amount of “break in period” miles? If so, will I have to buy another 3 bottles of royal purple gear oil and bottle of friction modifier? Or can I use a cheaper gear oil on first fill then drain and replace with royal purple?

        is it wise to dyno tune after installing new gears. I understand that the car needs to be tuned to correct the speedo, but is dyno the way to go if there is a break in period? When I am ready to get the gears in the near future, I’m also installing a new 1 piece driveshaft, lsd, axles, shorties, h pipe, cat back, shifter, and throttle body, so a tune will be necessary, but to push the new ring and pinion that soon seems like danger? Enlighten me.

        • We would recommend tuning your car for gears as well as the list of modifications you listed. However, you wouldn't necessarily need to go with a dyno tune. A tune from Bama or VMP tuning would be sufficient enough.

        Helpful (0)
        Post Your Question
        10 More Questions
        My manual shows the rear axle fluid capacity is 5.25 pints which equals 84 fluid ounces. 2 quarts of Royal Purple fluid equals 64 ounces plus 3.8 ounces of friction modifier equals 67.8 ounces. That’s 16.2 ounces short of the capacity. Is that ok or should I buy another quart and use half? 0 answer
        What is the brand/manufacturer of the bearings that come in this kit and are they Made in USA? 1 answer
        What gears are better for both roll racing and from a stop ? 3.55s or the 3.73s , im having trouble with the choosing ! 1 answer
        Don't you have 3.31 option for these kits? 1 answer
        I own a 14 V6. I was thinking of going with ford performance 3.55 or 3.73 gears. Do I need to buy the Trac lock disc kit? What are benefits of buying that kit as opposed not getting it? My car is a daily driver and mostly hwy. Don't want to lose significant MPG. Thanks 1 answer
        Hello Will this gearing be too much for s supercharged car(14 GT)? Recommmend higher or lower gearing? Currently running 3.15s Thanks in advance 1 answer
        hy, i have a 2012 v6 convertible automatic, if i want to upgrade my gears, which is the best for me, 3.55, 3.73 or 4.10, daily driver! mine comes with stock 2.73 gears? 1 answer
        im confused how many quarts of the royal purple do you need, because some people have said i need 3 qts and this only includes 2 it is a 2014 mustang v6 1 answer
        The Ford Performance 3.55 Gears and Install Kit (10-14 V8; 11-14 V6) will not come with the new pinion bearing that is needed for the 2010 mustangs. You would need to buy this separate. i have a 2013 mustang gt. so will i still need a pinion bearing for my car, cause on list it says it comes with a pinion bearing? 1 answer
        Do you have to buy the trak loc rebuild kit? 1 answer

          Customer Reviews (27) Write a Review

          Overall Rating 4.6

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Performance Gain 4.692307 4.7
          • Fit 4.692307 4.7



          • 5/5

            Installation Time: Full Day

            July 07, 2018

            great kit

            everything you need is here ,at a GREAT price , can't beat AM

            AnthonyT

            Year: 2011 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            April 11, 2018

            Great

            Had a offroad and performance shop install them, no noise. Feels great and makes the car more fun to drive.

            KeyvanN

            Year: 2012 Submodel: V6

            Helpful (7)

          • 2/5

            March 19, 2018

            Good gear ratio

            It's a good gear ratio but my gear broke so it's up to you if you want to buy this one

            TonyBoss

            Year: 2013 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            February 27, 2018

            Pulls Like a Champ Now!

            I love this set of gears. Big difference from the stock 2.73s. I chirp the tires quite often because I forget about the new freed up power. Gas mileage not really affected. Shop install because I wanted done right!

            DeadpoolStang

            Year: 2014 Submodel: V6

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            February 15, 2018

            Big difference !

            Put in a cai, performance exhaust, shorty headers and now 3.55 gearing from the 2.73. Really pulls hard now in low to mid rpms.

            DonC

            Year: 2014 Submodel: V6

            Helpful (10)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            February 02, 2018

            great value

            This kit is common on other sites for a similar price But without the Fluids. So basically Free Royal Purple and ford friction additive is a deal to good to pass on. This is a great upgrade and very affordable so its a win-win.

            MadisonR

            Year: 2012 Submodel: V6

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            November 24, 2017

            3.55 for the 5.0

            Car came stock 3.15 cause it’s the Auto so putting in the 3.55 should be a good upgrade for when I drop the boss intake under the hood super excited to do this build

            AzeeJ

            Year: 2013 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            July 01, 2017

            Best alternative

            Before I have install this Kit, I have a 3:73 kit and the sounds from the rear axle was to much. Now it will be silence and in combination with the carbon driveshaft it was perfect.

            RKestel

            Year: 2011 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            June 27, 2017

            Big improvement

            Years of 2.73 gears, wow what a difference. I will say that they do make a little noise over the stock gears. Car seems much quicker now, RPMs come up much faster. Before I would step on the gas and wait for something to happen.

            Stevew

            Year: 2011 Submodel: V6

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            June 08, 2017

            3.55 gear and install kit

            Awesome. Everything you need to install gears and makes it easy and affordable.

            BryanS

            Year: 2014 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            June 02, 2017

            Best performance gain for the $$

            Went from 2.73 to 3.55 in my 2012 V6. Amazing difference in acceleration and drive-ability. I also installed the cobra limited slip diff at the same time, which I highly recommend since the carrier will be out anyway. You will need the extra traction too with the gear change. It took 2.5 quarts of fluid, so get an extra quart. Install kit was good quality as well. I highly recommend a shop install as this is precision work to do it properly.

            MaxS

            Year: 2012 Submodel: V6

            Helpful (9)

          • 4/5

            July 12, 2016

            Great Gears

            I bought these gears instead of the 3.73's because i drive the highway 2 hours everyday and this was a great decision! once i got it tuned the gears banged like no other, felt like a completely different car with a lot more torque. Great value, came with everything i needed, install wasn't to hard but thats also because my buddy and i are mechanics. definitely worth the money!

            Stang

            Year: 2012 Submodel: V6

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            June 14, 2016

            More responsive.

            Changed from 3.31 to 3.55 ratio. Car is "Quicker" in each gear so I am shifting faster as a result. Roll on throttle in 3rd - 5th gear is substantually better than it was. 6th gear is still a good highway gear (2200 rpm @ 80 mph.). I still haven't traveled any distance to get an idea of GPM difference. I am happy with the change. Almost seems like driving a different car.

            Chris

            Year: 2013 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            October 16, 2015

            Don't look back.

            If you are not satisfied with your stock 2.73's or feel like you want to bump up the power, GET THESE or 3.73's. I have not tuned my car yet but I noticed a huge torque gain in every gear. Throws my head back in every gear except 6. Find a reputable shop to Install these. Don't waste money on other bolt on parts before you do this!!

            Jiggletbigcligs

            Year: 2014 Submodel: V6

            Helpful (8)

          • 4/5

            Installation Time: Full Day

            September 26, 2015

            gear kit

            a big improvement.using much more of the available torque.The stock gears were for fuel economy and not performance.if you have the 2.73 this is a must.Had to learn how to drive it all over again but well worth it.

            Sylvia2011

            Year: 2011 Submodel: V6 bedford.michigan

            Helpful (7)

          • 5/5

            Installation Time: Full Day

            September 24, 2015

            3.55 Gears

            Just had my gears installed today. Local Ford dealer did an outstanding job. I have read here about install missteps. Install was done right. Took all day but the wait was worth it. Feels like a new car. Definitely worth the effort and money. Great service from American Muscle also.

            RickD2XNE

            Year: 2014 Submodel: V6 Lincoln, Nebraska

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            June 15, 2015

            Better performance

            My v6 automatic had stock 2:73 gears. Great for 32 mpg but nothing else. I needed more power to the road a lower speeds when driving thu the twisties. Had them professionally installed for $350.00 . I can do most thing on a car but wouldn't think of putting gears in myself. Well worth the 350 install price.

            Frank

            Year: 2013 Submodel: V6 easley, SC

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            June 14, 2015

            New gears, way better than stock!

            I had a local shop put the gears in while I was at work. It took them about half a day and the install was $408. He recommended a break in period of 300 miles. Then when they were ready I hit the gas and noticed a big improvement over stock. I had to wait a few days for a new tune to fix my speedometer but I just used my gps to get by. My car now runs about 2100 rpms at 70 so I don't think my gas mileage will change much. Now that I have the shorty headers, throttle body, CAI, Bama tune, and gears it's a LOT more fun to drive!

            Optimized

            Year: 2012 Submodel: V6 Mount Pleasant, WI

            Helpful (8)

          • 3/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            May 14, 2015

            3.55 ring and pinion kit

            ring and pinion were fine and accomplished what I wanted but the bearing and seal kit was not the right one for my year mustang. Better check the kit before giving it to your installer. Also there is not enough rear end oil in the kit to fill it. It was about 3 pints short.

            Max

            Year: 2011 Submodel: GT Illinois

            Helpful (7)

          • 3/5

            Installation Time: Full Day

            November 02, 2014

            3.55 gears

            Decent quality kit, but I believe Ford Racing offers much better quality, so I would recommend buying all Ford Racing parts and forget the kit. My biggest disappointment is with the shim assortment. You will receive numerous shims of the same size so there is no way to precisely adjust your contact pattern without buying additional shims.

            My2014Stang

            Year: 2014 Submodel: V6

            Helpful (7)

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