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Ford Speedo Gear - 21 Tooth (83-98 w/ Automatic Transmission)

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Market Price $21.99 You Save 10% ($2.14)
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  • Item 53685

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    Features & Details

    • Corrects Speedometer for Gear Changes
    • Purple - 21 Tooth Speedo Gear
    • Genuine Ford Part
    • Ford Part# D0OZ-17271-B
    • Speedo Gear Retaining Clip Included
    • Fits 1983-1998 Mustangs with a Automatic Transmission
    Corrects Speedometer. Changing the rear gears in your Mustang is great for performance, but it will also throw off your speedometer. Now you can correct your speedometer readings with a Genuine Ford Speedo Gear from AmericanMuscle.

    Ford Motorcraft Quality. When adding performance parts to your Pony, trust the folks that know it best to provide top quality components that are made to out perform and out last the competition.

    Application. This Genuine Ford 21 Tooth (Purple) Speedometer Gear is for use with 1983 to 1998 Mustangs equipped with a automatic transmission that have changed gear ratios to accurately correct MPH reading of your speedometer. A speedo gear retaining clip is included.


    Speedometer Chart


    Axle Ratio


    6 Tooth Drive Gear


    7 Tooth Drive Gear


    8 Tooth Drive Gear
    2.73 - 16 18
    3.08 - 18 20
    3.27 16 19 21
    3.55 17 20 23
    3.73 18 21 -
    4.10 20 23 -
    4.30 21 - -
    4.56 23 - -


    Transmission


    16T


    17T


    18T


    19T


    20T


    21T
    Manual Wine White Yellow Pink Black Red
    Automatic Blue Green Gray Tan Orange Purple


    Manual Transmissions with 7 Tooth Drive Gear
    • 1983-1989 T-5 OEM
    • Pre 1993 T-5 Aftermarket
    • 1996-1998 Cobra T-45 OEM
    • All Tremec Transmissions


    Manual Transmissions with 8 Tooth Drive Gear
    • 1990-1998 T-5 OEM
    • 1996-1998 T-45 OEM Except Cobra


    Automatic Transmissions with 7 Tooth Drive Gear
    • 1983-1989 Automatic Transmissions


    Automatic Transmissions with 8 Tooth Drive Gear
    • 1990-1998 Automatic Transmissions

    Fitment: 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Details

    MPN#C1DZ-17292-A

    more

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

    What's in the Box
    Hardware included:
    • (1) Speedo Gear
    • (1) Retaining Clip
    Installation Info
    Tech Specs

    Manual Transmissions with 7 Tooth Drive Gear

    • 1983-1989 T-5 OEM
    • Pre 1993 T-5 Aftermarket
    • 1996-1998 Cobra T-45 OEM
    • All Tremec Transmissions

    Manual Transmissions with 8 Tooth Drive Gear

    • 1990-1998 T-5 OEM
    • 1996-1998 T-45 OEM Except Cobra

    Automatic Transmissions with 7 Tooth Drive Gear

    • 1983-1989 Automatic Transmissions

    Automatic Transmissions with 8 Tooth Drive Gear

    • 1990-1998 Automatic Transmissions

    Will it fit my Mustang?
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Other - 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98

    For use with Mustangs equipped with a automatic transmission

      Customer Photos (1) Submit Your Photo

      View 1 Photo

        Questions & Answers (3)

        3 Top Rated Questions

        I have a '98 GT with 373 gears. What size do I need?

        • At this time, we do not offer a size for the 3.73 gears with the automatic transmission.

        Helpful (0)

        I've got a 96 gt automatic and planning on dropping a set of 410s is this 21 tooth Speedo gear the only thing I need to correct my speed or can I just correct it with a tune and use my tuner?

        • The 21T Ford Speedo Gear will accommodate for 3.27 gears in your 1996 Mustang. You will need to change our drive gear and speedometer gear to accommodate for 4.10's. A 6T Drive and 20T speedo gear will be required to accommodate for these gears. 

        Helpful (0)

        Compatible with '94 Auto GT? Will this correct the speedo on my '94 Mustang GT Auto? if not, which speedo gear is needed?

        • Depends on which gear ratio you went with and what speedo drive gear your transmission has but definitely fits the automatic for your year pretty easy to install aswell

        Helpful (0)
        Post Your Question

          Customer Reviews (17) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Less than 1 Hour

          • Performance Gain 3.928571 3.9
          • Fit 5 5



          • 5/5

            Installation Time: Less than 1 Hour

            May 14, 2019

            Does the job

            Worked perfectly to correct the speedometer after installing my 3.73.1 rear end.

            BrianZ

            Year: 1989 Submodel: LX

            Helpful (0)

          • 4/5

            Installation Time: Less than 1 Hour

            November 01, 2016

            speedometer gear replacement

            works good only about one mph off. was given the wrong gears at first but was given the righh one - very good service

            aj

            Year: 1986 Submodel: GT

            Helpful (4)

          • 5/5

            August 22, 2016

            ford speedo gear.

            The product is good; However it did not solve the problem.

            DaddyCool

            Year: 1996 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            June 07, 2016

            Great

            Part worked great.......................................m

            speedo

            Year: 1991 Submodel: Other

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            December 25, 2015

            Worked perfect

            I installed the 140 MPH instrument overlay and had the local speedometer shop calibrate the speedo head from 85 to 140. After that installed 3:73 gear kit, and 17" Cobra wheels. I used the speedometer gear correction chart and my speedometer is amazingly within 1.5 mph. I'm very satisfied with the gear and AM.

            Mak2403

            Year: 1987 Submodel: GT Racine, Wi.

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            September 20, 2015

            as advertised

            speed is accurate now, bought to adjust speed with new 3.73 gears

            chuckie1

            Year: 1991 Submodel: Other houston,tx

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            May 14, 2015

            21 tooth speedo gear for automatic

            I changed the rear ended gears in my 1988 5.0LX, the chart made selection of the correct gear simple. This gear fit perfect and installed very easy, and came with a new clip

            Jay

            Year: 1988 Submodel: Other Edmonton, Albert

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            December 18, 2014

            Identical to original.

            Great replacement part along with the clip for the installation. It took me longer to put the Stang on the lift, then to install the gear.

            P51Mustang90

            Year: 1990 Submodel: Other Jacksonville, NC, USA

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            July 23, 2014

            Speedo Gear

            Fitment was really easy and only took me about 45 minutes. Definitely fix my speedo and made it dead accurate with my gps. Great product. Oh and really fast shipping. Thanks AM!

            italianstallion

            Year: 1998 Submodel: GT Fayetteville, GA, USA

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            November 25, 2013

            easy installation

            The product worked great, easy application I received it quick and the application chart was accurate on choosing the correct gear.

            scotty47

            Year: 1991 Submodel: GT Waldorf, MD, USA

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            October 18, 2013

            21 Tooth Gear

            A must have when changing the rear end gears of your automatic Mustang. Corrects the Speedometer dead on. Quick, easy installation. Not all shops carry these items, so its best to be ahead of the game and make sure you have every parts you need.

            Mike124

            Year: 1994 Submodel: V6 Saskatoon, SK, Canada

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            September 10, 2013

            Solved my Speedo Issue

            Fast shipping, fit like a glove. Only took about 5 minutes to install and now I have an accurate speedo!

            Gramps2

            Year: 1988 Submodel: GT West Chester Ohio

            Helpful (6)

          • 5/5

            Installation Time: Less than 1 Hour

            August 14, 2013

            easy install, easy fix

            Quick fix for your speedo. Installs in just minutes.

            jd89pony

            Year: 1989 Submodel: Other Columbus, OH, USA

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            May 21, 2013

            21 tooth speedometer gear

            I purchased one of American Muscles' 21 tooth speedometer gears for my 1997 mustang after i swapped differentials going from a 2.73 gear to a 3.27 gear. I wasn't sure which gear i would need to correct the speedometer, but their detailed explanation of what gear goes with which transmission and differential gear was the most helpful out of anywhere else i looked. I received the gear and it was in and working perfectly in ten minutes. I highly recommend this gear, it and American Muscle will save you allot of time and headaches.

            ryans97redstang

            Year: 1997 Submodel: V6 Martinsville, IN 46151, USA

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            November 08, 2012

            corrected the speedometer!

            A+ fit right in and corrected my speedometer readings with my 3.73 gear swap.

            88blackGT

            Year: 1995 Submodel: Cobra NJ

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            February 24, 2012

            This product works great

            easy install and product works great and is well made

            1Mustanger

            Year: 1989 Submodel: Other Greeneville TN.

            Helpful (4)

          • 5/5

            August 21, 2011

            Speedometer gear

            Everything fit perfect and had no problems at all. Thanks to the guys for there information.

            George Durbin

            Year: 1989 Submodel: GT

            Helpful (3)

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