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

Market Price $17.99 You Save 17% ($3.00)
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$14.99

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  • Item 53682
  • MPN#53648

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Features & Details

  • Corrects Speedometer for Gear Changes
  • Red - 21 Tooth Speedo Gear
  • Genuine Ford Part
  • Ford Part# C4OZ-17271-A
  • Speedo Gear Retaining Clip Included
  • Fits 1983-1998 Mustangs with a T5 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 (Red) Speedometer Gear is for use with 1983 to 1998 Mustangs equipped with a T5 manual 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
2.73-1618
3.08-1820
3.27161921
3.55172023
3.731821-
4.102023-
4.3021--
4.5623--


Transmission


16T


17T


18T


19T


20T


21T
ManualWineWhiteYellowPinkBlackRed
AutomaticBlueGreenGrayTanOrangePurple


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?
  • Cobra - 94, 95, 96, 97, 98
  • Foxbody - 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • V6 - 94, 95, 96, 97, 98
  • GT - 94, 95, 96, 97, 98

For use with Mustangs equipped with a T5 manual transmission

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
outstanding

The solution for my speedo after being off about 20 mph. after swapping from 2.73 to 3.73 The down side, American Muscle was out of stock when i needed it, and is a little frustrating when my favorite ...

Read More
Helpful (4)

5/5
Red Gear for 3.73 it works

Takes longer to lift car than it does to pull speedometer cable out of transmission

Helpful (2)

Overall Rating 4.8 out of 5 stars
Read All 26 Reviews

Customer Photos (1) Submit Your Photo

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12 Questions / 5 Answers

Ask a Question

I have a 94 v6 with a 5 speed and 4.10 gears what Speedo gear will I need

DeanR

I know this has probably been asked again and again but could you possibly tell me what the correct set up I would need to correct me speedometer please? 1997 mustang cobra 4:10 gears T-45 transmission.

Gearman19

  • For a 1997 Cobra with 4.10 Gears, and a T45 Transmission you will need a 23 Tooth Speedometer Gear.

    VincentV

Helpful (0)

I have a 98 gt 5 speed that originally came with 2.73 gears and I switched to 3.73 gears. What gear would correct my speedo

Mark

  • Your 1998 GT would come equipped with an 8 tooth drive gear, which does not have a matching speedo gear to properly adjust for the 3.73 gears you have installed. You would require a 21 T Ford Speedo Gear and a 7 tooth Ford Speedometer Drive Gear in order to properly adjust the speedometer.

    Rob D

Helpful (0)

Which gear would i need for a 95 V6 with stock gears?

jared95stead

  • In order to answer this, we would need to know if you have an automatic or manual transmission, as well as which rear gears your car came optioned with from the factory.

    Rob D

Helpful (0)

So I have a 98 v6 and I switched my rear end with a 03 gt with stock gears, what Speedo gear will I need

MichaelL

  • You would need either a 21 tooth RED if manual or a 21 tooth PURPLE if automatic.

    AMjordan

Helpful (0)

I have 3:90 gears,will speedometer gear should I get to correct my speed?

Charles

  • Unfortunately, Ford does not make a Speedometer Gear for 3.90 gears.

    VincentV

Helpful (0)

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Customer Reviews (26) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.090909 4.1
  • Fit 5 5



  • 5/5

    July 11, 2011

    outstanding

    The solution for my speedo after being off about 20 mph. after swapping from 2.73 to 3.73 The down side, American Muscle was out of stock when i needed it, and is a little frustrating when my favorite store don't have the parts

    Adolfo

    Year: 1992 Submodel: Other

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    December 26, 2016

    Red Gear for 3.73 it works

    Takes longer to lift car than it does to pull speedometer cable out of transmission

    Newbee90GT

    Year: 1989 Submodel: LX

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    September 24, 2015

    Cobra speedo gear install

    Install went smooth. Was 3.08 went to 3.73. Bought highest tooth gear they had. Not quite enough still 3-4 mph off. Could put a different gear inside the transmission to make it right on. But don't want to do that much work. Product was as described and shipped fast. Will buy from them again.

    Dadeo

    Year: 1994 Submodel: Cobra iowa

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    September 18, 2015

    Works for 3.55

    I have 3.73 gears and have to install 7 tooth drive gear to make work properly. Currently have 23 tooth and am 10 mph off at 70 mph so this with the right drive gear will fix it

    95cobra

    Year: 1995 Submodel: Cobra Markham tx

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    January 01, 2013

    Corrects Speedometer after gear change

    Use the chart on AM's website and you will find the correct gear for your application.

    Jmil918

    Year: 1995 Submodel: GT Wichita, Ks

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    June 29, 2012

    Speedo gear

    Quick And easy way to correct your speedo when changing rear end gears. Easy to install great product. Thanks American muscle.

    Darrell

    Year: 1996 Submodel: GT Forsyth,ga

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    March 30, 2012

    Speedo gear

    Simple change out. This 21 tooth gear corrects for a 3:73 gear change. American Muscle rocks!

    JimRob

    Year: 1997 Submodel: Cobra

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    July 07, 2017

    Perfect!

    Good quality, great price! Super easy to install with zero problems.

    Santos

    Year: 1993 Submodel: LX

    Helpful (1)

  • 5/5

    March 17, 2017

    21 Tooth

    I switched to 3.73 gears, so this was a must! The speedometer will be a significant amount off without it.

    AK

    Year: 1985 Submodel: Other

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    February 14, 2017

    Great product

    Great product as always! Just advise to really decide what you need before ordering all factors count!!

    Casey

    Year: 1988 Submodel: LX

    Helpful (1)

  • 5/5

    December 26, 2016

    Perfect.

    Used in a 1996 cobra when going to 3.73 gears. Easy install, gets into boost much quicker now. Excellent product.

    96HellionCobra

    Year: 1996 Submodel: Cobra

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    May 04, 2016

    My Blue GT 1993

    Hi Everyone i just picked up this 1 owner 93 GT Convertible and it needs a bunch of little stuff and some TLC. AM has helped me with my parts needed to wake up my GT and have her looking pretty. Thanks for help and parts to do my job... NICK R.

    BlueGT

    Year: 1993 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    September 18, 2015

    Quick Install, speedo still off by 5mph

    My car had 2.73 gears from ford, and now has 3.73 gears. I installed the 21 tooth speedo gear yet my speedometer is still reading 5 over my gps. The 23 tooth would make the speed read too low, so I guess this is as good as it gets.

    Peeta

    Year: 1995 Submodel: GT Pittsburgh, PA

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    May 27, 2014

    Speedometer reading

    Replaced the ring & pinion on my 1998 GT from 2.73 to 3.31 . Installed 21 tooth gear to correct speedometer . Now @ approx. 41 / 42 MPH on the speedo , I'm doing 40 MPH per my GPS . Would have to say the product works very well .

    Krissy

    Year: 1998 Submodel: GT Winnipeg, MB, Canada

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    July 30, 2012

    quick an easy fix

    Iv got a 98 gt that i have been building over the past year an from the fully built rear to the mildly built motor iv bought all of my performance gear from the one an only "American Muscle", an recently installed the 21 tooth speedo gear to try an help my drastic speedometer gain due to my ford racing 4.30s, the 21 tooth speedo gear helped a little but my speedometer is still off a little. Is there a speedo gear with more than 21 teeth? Over all good product.

    built98

    Year: 1998 Submodel: GT Greenwood, DE 19950, USA

    Helpful (1)

  • 5/5

    July 02, 2012

    speedo gear

    I was lost trying to figure out the right one for my car, but AM support helped me with all my question and got the right one for my car.

    LM96GT

    Year: 1996 Submodel: GT Lawrenceburg, KY 40342, USA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    June 29, 2012

    speedo gear

    the right piece and do the job correction of spedo

    mario1958

    Year: 1993 Submodel: GT Montreal, QC, Canada

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    November 22, 2017

    Worked great.

    Actual Ford part. Switched from 2.72 to 3.27 gear ratio. Installed no problem, and works great.

    MatthewG

    Year: 1996 Submodel: V6

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 21, 2017

    Worked Great

    The previous owner didnt boyher to change the gear after putting 3.73's in the rear. I was about 14 mphs off at 70, so 70 was actually 56 per gps. I changed this gear and brought it down to within 2-3 mphs. I also have 275 60R 16 rear tires so it migjt have actually put it spot on if I had not had the larger tires.

    PONYBOY1

    Year: 1998 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 16, 2017

    speedo gear for 373s

    worked great easy install finally speedo is true again. 373s will throw it off if u didn't know.

    MarlonP

    Year: 1988 Submodel: LX

    Helpful (0)

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