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

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  • Item 53685
  • MPN#C1DZ-17292-A

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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

    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

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    2 Questions / 2 Answers

    Ask a Question

    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?

    freddie

    • 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. 

      AMRobD

    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?

    Nickers

    • 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

      italianstallion

    Helpful (0)

    People Who Bought This Item Also Bought

    Customer Reviews (16) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Less than 1 Hour

    • Performance Gain 3.846154 3.8
    • Fit 5 5



    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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 (4)

    • 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 (3)

    • 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 (4)

    • 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 (3)

    • 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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