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

Item 53685
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      Product Information

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

      Features

      • 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

      Description

      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

      D0OZ-17271-B

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

      4.9

      Customer Reviews (17)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 17 customers

      Installation Time: Less than 1 Hour





      • May 14, 2019

        5 1989 LX - BrianZ Installation Time: Less than 1 Hour

        Does the job

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

        Helpful (0)
      • November 01, 2016

        4 1986 GT - aj Installation Time: Less than 1 Hour

        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

        Helpful (4)
      • August 22, 2016

        5 1996 GT - DaddyCool

        ford speedo gear.

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

        Helpful (6)
      • June 07, 2016

        5 1991 Other - speedo Installation Time: Less than 1 Hour

        Great

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

        Helpful (5)
      • December 25, 2015

        5 1987 GT - Mak2403 Installation Time: Less than 1 Hour

        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.

        Helpful (4)
      • September 20, 2015

        5 1991 Other - chuckie1 Installation Time: Less than 1 Hour

        as advertised

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

        Helpful (5)
      • May 14, 2015

        5 1988 Other - Jay Installation Time: Less than 1 Hour

        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

        Helpful (5)
      • December 18, 2014

        5 1990 Other - P51Mustang90 Installation Time: Less than 1 Hour

        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.

        Helpful (4)
      • July 23, 2014

        5 1998 GT - italianstallion Installation Time: Less than 1 Hour

        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!

        Helpful (5)
      • November 25, 2013

        5 1991 GT - scotty47 Installation Time: Less than 1 Hour

        easy installation

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

        Helpful (5)

      Questions & Answers (3 answers)

      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (1) Speedo Gear
      • (1) Retaining Clip

      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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