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Ford Performance 3.55 Gears and Install Kit (86-09 V8)

Item 100575
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Market Price $319.99 You Save 19% ($60.00)
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    Features, Video & Details

    • Money Saving Combo Kit
    • Ford Racing 3.55 Gears - 8.8"
    • Motive 8.8" Rear End Installation and Bearing Kit
    • (1) Bottle of Ford Racing Friction Modifier
    • (2) Quarts of Royal Purple Max Gear 75w90 Gear Oil
    • Fits 1986-2009 V8 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, 1 bottle of Friction Modifier, 2 bottles of 75w90 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 Speedometer Gear, 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 1986-2009 GT, Bullitt, Mach 1, Shelby GT500 and 1994-1998 SVT Cobra. It will not fit the 1999-2004 IRS equipped Cobra Mustangs.

    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: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Details

    MPN# 100575

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    • (1) 3.8 fluid oz bottle of Friction Modifier
    • (2) one quart bottle of Royal Purple Max Gear 75w90 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?
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98
    • Cobra R - 93, 95
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09
    • GT500 - 07, 08, 09
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86

      Customer Photos (2) Submit Your Photo

      View All 2 Photos

        Questions & Answers (14)

        5 Top Rated Questions

        If the 8.8 requires 3 quarts of gear oil why are there only 2 quarts included in the "complete" kit?

        • The fluid capacity of the 8.8 rear for 1986-09 Mustangs is 2qts of gear oil or approximately 3.8 pints.

        Helpful (5)

        What other bearings are needed to rebuild my diff that arnt included in this kit

        • The Ford Performance 3.55 Gears and Install Kit will include front and rear pinion bearings, carrier bearings, differential bearings. In addition to this, axle bearings would be required to completely rebuild your rear end.

        Helpful (2)

        Would this be a good gear ratio for a person who uses his car as main mode of transportation?

        • Yes, 3.55 is a good performance option for a daily driven Mustang.

        Helpful (1)

        If I install these in my 95 Mustang Gt. Will I also need to get a Ford Speedo Gear to keep speedo right? I be using these to replace a set of 3.09 stock gears..

        • When installing the Ford Performance 3.55 Gears and Install Kit you will need to install a speedo gear to correct your speedometer reading. You will require either a 23T speedometer gear paired with your stock 8 tooth drive gear, or a 7 tooth drive gear paired with a 20T speedo gear. We typically recommend against 23t speedo gears, as they have a tendency to wear rapidly.

        Helpful (1)

        Have a 2006 GT Automatic is this too high of a gear to install?

        • This gear ratio would not be too high no! If you drive some back roads and highway this would be a very good ratio to go with.

        Helpful (1)
        Post Your Question
        9 More Questions
        hi whats the difference in fuel mileage between 3.55 and 3.73 1 answer
        Can I run either 28 or 31 spline axles with these? 1 answer
        Own a 2007 Mustang GT changing the rear differential seal do you have to torque the bolts down. 1 answer
        Will this kit work with the 03-04 Cobra IRS, and if not which one can be used? 1 answer
        I have 1996 Mustang GT, and wonder after the Gears replace, do I need to use tuner to reprogram it? 1 answer
        What if my Mustang already has 3.55 gears stock...will this kit be better then stock in anyway? If so how? 1 answer
        What Speedo gear would i need for my 97 gt after installing these gears to calibrate it properly 1 answer
        If I get this kit for my 97gt what Speedo gear do I need to get to correct speedometer? 1 answer
        Does this kit use the same hardware from the :FORD RACING RING PINION INSTALLATION KIT W/ HIGH TORQUE BEARING - 8.8IN (86-14 V8, 99-04 COBRA, 11-14 V6)? 1 answer

          Customer Reviews (26) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Performance Gain 4.5 4.5
          • Fit 5 5

          • 5/5

            Installation Time: Shop Install

            November 15, 2019


            Awesome works great and easy to install. I had a friend install it on his shop.


            Year: 2004 Submodel: Mach 1

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            January 17, 2019

            Great product

            Thanks fast shipping items as described thanks !!!!!!!!!!!!!!!!!!!!!!!!


            Year: 1989 Submodel: LX

            Helpful (3)

          • 5/5

            Installation Time: Afternoon

            August 24, 2018

            Just what I needed

            This was everything that I expected from a Ford Performance product, at a reasonable price. The gear change was a must going from naturally aspirated to supercharged. I previously had 4.10 gears and I'm happy with the outcome of the 3.55 gear selection. It gave me a great balance of power and highway cruising.


            Year: 2000 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Afternoon

            July 31, 2018

            new gears

            nice clean new gears work very well and speeding delivery


            Year: 1990 Submodel: LX

            Helpful (8)

          • 5/5

            Installation Time: Weekend

            February 20, 2018

            Needed upgrade

            The difference in acceleration is noticed, but you don’t sacrifice highway drivability!


            Year: 1998 Submodel: GT

            Helpful (13)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            November 18, 2017

            Everything needed

            I purchased a high mileage 07 GT that definitely needed the rear ending rebuilt. This kit has all the parts to make it work like it did from the factory.


            Year: 2007 Submodel: GT

            Helpful (11)

          • 5/5

            October 16, 2017

            Great gears

            Great gears for 93 with AOD transmission. Item shipped quick


            Year: 1993 Submodel: LX

            Helpful (10)

          • 5/5

            Installation Time: Full Day

            October 02, 2017

            Good kit

            All quality parts. Installation was simple. Removal of old was a pain... Set-up and alignment with new diff was time consuming but not hard. Installed in a crown vic police and ended up needing a little more oil than the 2qts provided. Overall great kit, would recommend to anyone.


            Year: 2004 Submodel: V6

            Helpful (10)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            September 16, 2017


            Nice upgrade. Takes off a lot quicker and helps overall acceleration.


            Year: 1998 Submodel: GT

            Helpful (10)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            July 24, 2017

            It's a great kit!

            This is the best deal you'll find on gear kit! The only downside is you only get 2 quarts and it takes more than that. Other than that it's great!!


            Year: 2002 Submodel: GT

            Helpful (12)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            June 14, 2017

            geared up

            hey its gears and a Ford product so you know you good, everything you need is in the kit


            Year: 1993 Submodel: GT

            Helpful (10)

          • 5/5

            March 23, 2017

            great kit with a great price

            Haven't installed it yet but has everything you need to get the job done right. Thank you AM.


            Year: 1992 Submodel: LX

            Helpful (10)

          • 5/5

            Installation Time: Full Day

            January 08, 2017

            nice kit

            This kit is everything you need, first time installing a ring and pinion and it was a breeze, with this kit, at least for me, i reused all factory shims and after setting pinion depth everything fell right into place, nice kit would purchase again.


            Year: 1990 Submodel: GT

            Helpful (10)

          • 5/5

            October 17, 2016

            Ford Motorspot 3:55 gears

            I recently purchased Ford Motorsport 3:55 rear gears, an install kit and a Ford Motorsport rear cover. I took my car and parts to my friends shop. Later that day he advised me that the pinion gear (in the new kit) wasn't the correct one. I called American Muscle and I spoke with Mike. Mike was able to ship me out a new set of gears and set up my return without any issues. All of the parts have been installed. The original gears were 2:73's. The 3:55's made a great improvement.


            Year: 1987 Submodel: Other

            Helpful (11)

          • 5/5

            September 05, 2016

            Quality Product and a must have upgrade!

            The Mustang pulls so much harder now. Those factory 2.73 gears were awful. These Ford Gears Installed in 2 hours for a cost of $250 at my local shop. HIghly recommend for those who need to drive on the highway without over revving the engine, but cant still have fun at the track.


            Year: 1998 Submodel: GT

            Helpful (14)

          • 5/5

            August 10, 2016

            New parts solved my problem

            Great price on all the stuff you need. You could delete the Synthetic gear lube my repair shop recommended not using it. Noisy whine is gone.


            Year: 2003 Submodel: Mach 1

            Helpful (11)

          • 5/5

            July 15, 2016

            the best value by far

            I shopped around and even checked if a competitor could beat your gear/install kit deal and they could not get anywhere close to it. It has everything you need for a great price, what more do you want?


            Year: 1994 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Afternoon

            May 03, 2016

            Ford 3.55 Gear Install Kit

            Just finished installing the new gears in my 07 Mustang and couldn't be happier with the kit. EVERYTHING is included. Installation was a snap. If you are considering changing your gears, this is the way to go!


            Year: 2007 Submodel: V6

            Helpful (9)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            March 03, 2016


            Had these install by a shop and they work great you can feel the pull over the stock gears i would recommend these to everyone


            Year: 2003 Submodel: GT

            Helpful (12)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            December 18, 2014

            3.55 Gear Install Kit

            This kit came with all necessary items to replace my much needed bearings, ring and pinion.Noticed better acceleration as well after breaking in the gears. Would recommend this kit to anyone who wants more acceleration without sacrificing fuel economy. Thanks AM!


            Year: 2002 Submodel: GT Edinburg, TX, USA

            Helpful (13)

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