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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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  • 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 - 93, 94, 95, 96, 97, 98
    • Cobra R - 93, 95
    • 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 T5 manual transmission

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    13 Questions / 6 Answers

    Ask a Question

    I have a 1989 Mustang GT with a T5 manual transmission. I upgraded the rear gears to 3.73. Rear tire size is 245/50/16. Is the 21 tooth gear what i need to get the speedometer working correctly?

    Deanna

    • For your application, you will have a 7 Tooth Drive gear, requiring the 21 Tooth Ford Speedo Gear for proper speedometer operation.

      AMRobD

    Helpful (0)

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

    DeanR

    • Ford does not offer a Speedo Gear that will calibrate for 4.10 gears on your 94 V6. You will need to convert to a 7 Tooth Drive Gear and get a 23 Tooth Speedo Gear OR convert to a 6 Tooth Drive Gear and get a 20 Tooth Speedo Gear. You can find all our gears at the link below: https://www.americanmuscle.com/94-98-mustang-gears.html#shop-by8

      VincentV

    Helpful (0)

    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)

    People Who Bought This Item Also Bought

    Customer Reviews (28) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Less than 1 Hour

    • Performance Gain 3.833333 3.8
    • Fit 5 5



    • 5/5

      Installation Time: Less than 1 Hour

      March 14, 2018

      Works great!

      I got this in the mail a few days after it shipped. It only took me about 30 minutes to install and it works great. No problems at all!

      BrandonR

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      December 12, 2017

      Speedo gear

      Installed five minutes of works well . Nice to have a speedometer that works with the exact miles per hour

      Ghost191

      Year: 1993 Submodel: LX

      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 (2)

    • 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 (1)

    • 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 (1)

    • 5/5

      Installation Time: Less than 1 Hour

      August 17, 2017

      Speedo

      Did a rear end rebuild on my 88gt and upgraded the stock 2.73 gears to 3.73 Richmond gears and also put in Yukon posi unit.. well my Speedo was way off (15-20mph) and the 21 tooth Ford Speedo gear saved the day. Only took about 15 min to install.. This includes jacking the car up. Thanks American muscle!

      KennethW

      Year: 1988 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 18, 2017

      Worked perfectly

      Item works perfectly. Took less than a minute to install. GPS confirmed accuracy

      Jalani

      Year: 1998 Submodel: Cobra

      Helpful (1)

    • 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 (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 27, 2017

      NO more purchases from LMR

      ORDER SAME GEAR FROM LMR LAST FALL WHAT I GOT WAS A 23 TOOTH FOR AN AUTO TRANS. THANKS AMERICANMUSCLE FOR GETTING IT RIGHT WORKS WELL GLAD TO HAVE IT FIXED!

      AK

      Year: 1997 Submodel: GT

      Helpful (2)

    • 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 (2)

    • 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 (2)

    • 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.

      MattE

      Year: 1996 Submodel: Cobra

      Helpful (2)

    • 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 (4)

    • 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 (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 (4)

    • 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 (3)

    • 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 (2)

    • 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 (3)

    • 5/5

      Installation Time: Less than 1 Hour

      November 10, 2013

      Accurate Speedo

      I changed rear gears from 327 to 373 and this speedo gear made my speedo accurate with the new gears. Checked the accuracy with my GPS and found that speedo was optimistic by 1MPH under 60MPH and 2MPH over 60. That's good enough for me. I don't know how accurate the speedo was before the geae change.

      JohnS01

      Year: 1996 Submodel: Cobra Cape Neddick, Maine

      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 (3)

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