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Ford Performance Ring Gear and Pinion Kit - 4.10 Gears (86-93 GT)

Item 24002G87
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    Features & Details

    • Ford Racing Quality
    • Strong Forged Construction
    • 4.10 Gear Ratio
    • 8.8" Ring Gear Diameter
    • For Street or Track Use
    • Fits 1986-1993 GT and 5.0 LX Mustangs
    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. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

    Superior Quality. These Ford Racing 4.10 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.

    Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a new Speedometer Gear is an inexpensive way to fix this issue.

    Application. This Ford Racing Ring and Pinion Gear set will fit all 1986 to 1993 V8 Mustangs including the GT, 5.0 LX and Cobra models. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

    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 Details

    MPN# M-4209-88410

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    Installation Info
    Tech Specs

    Approximate RPM for 1986-1993 GT

    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 4261 5965        
    2 2516 3523 4529 5535 6542  
    3 1682 2354 3027 3700 4372 5045
    4 1264 1770 2276 2782 3287 3793
    5 847 1186 1525 1864 2203 2541

    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 3034 4248 5462 6676    
    2 1854 2596 3338 4080 4821 5563
    3 1264 1770 2276 2782 3287 3793
    4 843 1180 1517 1854 2192 2529
    Will it fit my Mustang?

      Customer Photos

        Questions & Answers (2)

        2 Top Rated Questions

        Will this ring and pinion work with all Ford 8.8 31 spline rear ends?

        • The Ford Performance 4.10 Gears are designed to work on the 86-93 V8 Mustangs that has an 8.8" rear end.

        Helpful (0)

        I'm assuming you can install these into the stock diff? I have an 88 gt

        • These Ford Performance 4.10 Gears will install into the stock 8.8" differential. We would highly recommend a rear-end installation kit with bearings, as well as friction modifier with your gear oil. The Ford Performance 4.10 Gears and Install Kit (item 100577) includes all the components for a complete installation on your application.

        Helpful (0)
        Post Your Question

          Customer Reviews (42) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$100-$250

          • Performance Gain 4.9 4.9
          • Fit 5 5

          • 5/5

            February 15, 2018

            Gear 4.10

            Good product ,my car mustang sounds really nice ,I really love to get stuff from American muscle.


            Year: 1988 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Full Day

            December 20, 2017

            Perfect Fit

            Used these to replace 3:55 stock gears. Almost a perfect wear pattern using the original pinion shims. Doesn't get much easier than that.


            Year: 1986 Submodel: Other

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            October 08, 2017

            4.10's shoulda been factory!

            Perfect install. I have abused them heavily at the track all summer. This car should have come factory with 4.10's! Sooo much fun!


            Year: 1990 Submodel: LX

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            June 02, 2017

            4.10 Gears

            Great product easy install only took about 3hrs. No noise after install. Turns about 2300 rpm at 65 with a t5.


            Year: 1990 Submodel: LX

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            May 23, 2017

            Great buy

            Have installed these gears before working at a ford dealership, good quality and my customers seem to like them. Bought them to replace my stock gears and to lower my quarter mile times.


            Year: 1991 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            December 27, 2016


            Can't say enough about the Great service from Am product arrived in California on time and was well packaged. Will continue to use American muscle in the future. 4.10 woke the car up big time feels like a rocket ship now.


            Year: 1990 Submodel: LX

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            May 24, 2016

            4.10 Ford Racing Gears

            Unbelievable the difference the way the car pulls now!!!! Woke my 91 LX up big time. I feel the best mod you can do other than intake heads etc etc American Muscle shipped fast....product was great just as described. Get the bearing kit when you swap gears..... Thanks A M!!!


            Year: 1991 Submodel: Other

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            May 29, 2015

            Ford Racing 4.10 Gears

            Great purchase for your Mustang. I have a high 9 second street driven Fox that i did the 4.10 gear install on. I do recommend a professional install, as it is crucial to properly have the gears shimmed correctly.


            Year: 1990 Submodel: Other Malvern, PA

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            April 04, 2013

            200 for shop install

            super nice GREAT improvement ggot a 5 speed next time ill got 3.73 my first gear is almost useless unless i wanna spin my cheater slicks like crazy 4.10 is a lil much but super fun still


            Year: 1990 Submodel: Other

            Helpful (7)

          • 5/5

            Installation Time: Weekend

            March 11, 2013

            Must have Mod!

            Great product for any Mustang. Absolutely changes the feel of the car. One of the best mods I have done!!!


            Year: 1988 Submodel: GT Hatboro, PA, USA

            Helpful (6)

          • 5/5

            May 12, 2011

            Not too much gear!

            I purchased these Ford Racing 410 gears and installed them myself. For those wondering the pinion measured .002 thicker than the original pinion with my 308 gears. This is actually fairly accurate. I ended up using the original pinion shim which was .027 thick. I rebuilt my Trac-lok and installed all new bearings along with these 410's to ensure nothing went wrong. In the end I ended up with a backlash of .008, zero runout, and a pinion preload of 22 in. lbs. The gears work great and with my T5 I think they feel great. They are not too much gear for a manual transmission. You do have to shift faster because they get you into your powerband so much quicker. I think 1st gear is a little short but that doesn't bother me. My speedo is exactly 10mph faster than my actual speed without changing the speedometer gear. The gears have not really effected my fuel mileage. If anything I'm wondering if they helped because it seems like I'm doing a little better on fuel. It might be because I reach my cruise speed sooner. Highway speeds are about 2200rpm at 70mph which is better than I thought it would be and that is running 225/50r16 tires. The gears are well worth what paid for on American Muscle and you can't beat the free shipping. If I had to do it over again I would certainly buy these again. Thanks AM!


            Year: 1991 Submodel: GT

            Helpful (9)

          • 5/5

            February 19, 2011

            4:10's or nothing!

            If you have a 96 or newer modular engine mustang then you don't need waste your money on anything less than a 4:10! This gear is a wake up call for our engines and is what Ford should have installed from the factory.


            Helpful (8)

          • 5/5

            January 05, 2011


            I got these installed recently and love them! Car shifts right when I want it too in the city (Auto) and avg mpg is increasing in the city as well...I havent tested them out yet cuz im letting them break in but I can feel a difference in responsiveness!


            Helpful (7)

          • 5/5

            December 28, 2010

            pushes you in your seat

            I got these 4.10 gears about 5 years ago, i had 3.73 before and man what a difference it made, car launches faster and responds quicker, i a must have if you want to wake up your mustang. A mustang shop in Denver recommended a go with 4.10 super happy with the swap

            Andres Navarro

            Helpful (7)

          • 4/5

            December 06, 2010

            Had both 3.73 and 4.10's

            Well to start off, these will def. help your acceleration. Im thinking I will go back to the 3.73's because top end is totally lost and at 70 im running 2500rpm+ with these and mpg was def. noticeable with these 4.10's, but they are fun in the city...there just not that great on the highway...probably helps also if you have a 6spd and not a 5 like mine. Cheers!


            Helpful (7)

          • 5/5

            September 26, 2010

            From 3.27 to 4.10

            So, it was time for a rebuild of the rearend. I ordered the Ford Racing 4.10 gears and installed them, I'm here to say, it has made an incredible difference. The cruising rpms went up by 500 or so. A great, noisefree product. Well worth it.


            Helpful (7)

          • 5/5

            September 17, 2010

            from 3:27 to 4:10

            the improvement is unreal, best thing you can do to the car for under $200, and the gas millage difference is almost unnoticeable.


            Helpful (8)

          • 5/5

            September 09, 2010

            you light up my life

            just had the 410 gears installed on Tuesday, and they are awesome, I had 331 gears with a automatic transmission, and couldn't stand how pathetic it was out of the hole, what a difference the 410 gears are, I am so happy I decided to do this. If your on the fence I would go for it!


            Helpful (8)

          • 5/5

            July 25, 2010

            4.10 gears

            Great gear!!! u can definitely feel the difference..if u have a convertible u must get 4.30 because of the weight!!! I regret not getting them!!!great product overall!!


            Helpful (9)

          • 5/5

            May 01, 2010

            4.10's all the way!

            i got the gears and the rebuild kit. took me from 14.0 @ about 101mph to 13.51 @ 108. my car is a daily driver and my gas mileage actually improved! Great buy, i recommend for these for everyone, its a must have!

            Nauder Bastankhah

            Helpful (6)

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