Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
$4,500 Giveaway! 3 Winners Enter Now

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

Item 100572
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $316.99 You Save 12% ($37.00)
Our Price

$279.99 (kit)

FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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 -


      Customer Reviews (27)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 27 customers

      Installation Time: Weekend

      Installation Cost: $250-$500

      • July 07, 2018

        5 2011 GT - AnthonyT Installation Time: Full Day

        great kit

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

        Helpful (5)
      • April 11, 2018

        5 2012 V6 - KeyvanN Installation Time: Shop Install Installation Cost: $250-$500


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

        Helpful (7)
      • March 19, 2018

        2 2013 GT - TonyBoss

        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

        Helpful (5)
      • February 27, 2018

        5 2014 V6 - DeadpoolStang Installation Time: Shop Install Installation Cost: $250-$500

        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!

        Helpful (9)
      • February 15, 2018

        5 2014 V6 - DonC Installation Time: Shop Install Installation Cost: $250-$500

        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.

        Helpful (10)
      • February 02, 2018

        5 2012 V6 - MadisonR Installation Time: Shop Install Installation Cost: $250-$500

        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.

        Helpful (7)
      • November 24, 2017

        5 2013 GT - AzeeJ Installation Time: Shop Install

        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

        Helpful (8)
      • July 01, 2017

        5 2011 GT - RKestel Installation Time: Shop Install Installation Cost: $250-$500

        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.

        Helpful (9)
      • June 27, 2017

        5 2011 V6 - Stevew Installation Time: Shop Install Installation Cost: $250-$500

        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.

        Helpful (9)
      • June 08, 2017

        5 2014 GT - BryanS Installation Time: Afternoon

        3.55 gear and install kit

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

        Helpful (7)

      Questions & Answers (17 answers)

      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)

      Hi. So, I’m planning to swap from stock 2.73 to 3.55 gears in my 3.7 manual. Is it necessary to tune for drivability or is the tune only useful for correcting the speedometer? TIA

      • We would suggest tuning for drivability when you make this change as there will be other changes to your vehicle besides changes to the speedometer. Your shifting will change for instance.

      Helpful (0)

      3.73 or 3.55 gears for my 2014 V6 mustang custom tuned for 91 premium fuel. I'm looking to get a little bit better fuel milage, what gear ratio would work better for my setup/daily driver custom tuned

      • 3.55 gear ratio would be better suited for highway use as the engine RPM would be lower than a 3.73 gear ratio at the same speed.

      Helpful (0)

      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:

      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)
      Post Your Question
      10 More Questions
      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? 0 answer
      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. 1 answer
      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

      Installation & What's in the Box

      Installation Info

      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

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • GT - 10, 11, 12, 13, 14
      • GT500 - 10, 11, 12
      • 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.

          Related Mustang Categories