Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now
Coronavirus: We are Open For Business, Prioritizing health and safety Learn More

Ford Performance Speedometer Recalibration Tool (94-10 All)

Item 50139
AmericanMuscle no longer carries the Ford Performance Speedometer Recalibration Tool (94-10 All). Please check out Mustang Custom Tuners for an updated selection.
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P

    Review & Installation Video

    Product Information

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


    • Corrects Speedometer for Tire Size Changes
    • Corrects Speedometer for Rear Gear Changes
    • No Reprogramming of PCM Necessary
    • Easy 4 Wire Installation
    • Fits 1994-2010 Mustangs


    Corrects Speedometer. Is your Pony's speedometer off because you changed your rear gear ratio or tire size? Then you will need a Ford Racing Speedometer Recalibration Tool to correct your speedometer.

    No Reprogramming Needed. The Ford Racing Speedometer Recalibration Tool scales a frequency based on the vehicle speed signal up/down to maintain accurate speed indication to the speedometer and to the PCM with no reprogramming of PCM necessary.

    Application. This Ford Racing Speedometer Recalibration Tool will work on the 1994-2004 automatic and manual Mustangs as well as 2005-2010 manual Mustangs. 2005-2010 automatic Mustangs are limited to the equivalent of one step higher or lower gear change ratio (< /- 10% change).

    Fitment: Details

    CA Residents: WARNING: Cancer and Reproductive Harm -


    Customer Reviews (61)

    Write a Review

    Ratings Summary

    4.3 out of 5 overall rating from 61 customers

    Installation Time: Afternoon

    Installation Cost: $100-$250

    • March 24, 2019

      4 1998 GT - PaulS Installation Time: Less than 1 Hour

      Speed Cal

      Easy install and really works. No complaints. Had to

      Helpful (0)
    • January 10, 2019

      5 1996 V6 - Titiania Installation Time: Less than 1 Hour

      Works great

      Really had to adjust it a few times to calculate everything right. But Once you got it dialed in right. It works like a charm.

      Helpful (2)
    • December 09, 2018

      5 2003 Mach 1 - NathanW Installation Time: Afternoon

      '03 Mach One

      Wring banks will be different for Mach 1 from the instructions for 99/01 Cobra if you use the under the hood route. Just find and use the green/white wire and all will work out well.

      Helpful (2)
    • July 09, 2018

      5 1996 GT - ChrisK Installation Time: Afternoon

      Highly Recommend

      1996 Mustang GT with 373 gear swapped from T45 with VSS to 3650 with OSS. Set this recalibrator to 0,2,4 and the speedo is very close when compared with a GPS speedometer. The instructions are very good and I recommend splicing into the harness in the engine bay. Highly recommend.

      Helpful (6)
    • May 15, 2018

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


      Hard to soder in because the factory wire harness is short, but works great

      Helpful (6)
    • May 12, 2018

      4 1996 GT - JeffB Installation Time: Afternoon

      Working after transmission swap to a 3650

      I removed my t45 and switched to a t3650 tremec. The only downside was the lack of instuctions for the setting it up when going from vss to oss. I just got it reading close to being correct after setting ihe dials to 0 2 4.

      Helpful (9)
    • April 16, 2018

      5 2004 Mach 1 - GaryD Installation Time: Shop Install Installation Cost: $250-$500

      Recalibration Tool Worked!

      Installed the recalibration tool on my 2004 Mach I to fix the speedometer with the 4.10 gear and tire changes. Tool was easy to calibrate and the speedometer works perfectly.

      Helpful (6)
    • March 26, 2018

      4 2007 GT - WilliamP Installation Time: Less than 1 Hour

      Does the job spend the extra and get a tuner.

      Worked well for calibrating the speedo. Easy install. Those who are wanting to installed 4.10 gears in a 2007 mustang beware that if you install this you will lose your cruise control. Also even with traction controls off engine will pull power when under heavy throttle to keep traction. Going from 3.35 to 3.73 is to big of a jump in gear ratio. The PCM will detect the difference and that is why you lose cruise control. If you are only going up one set of gears let say from 3.35 to 3.55 this will work great. Just can’t jump up from 3.35 to 3.73. Save yourself some time and buy a tuner.

      Helpful (6)
    • March 07, 2018

      5 1997 Cobra - TravisM Installation Time: Less than 1 Hour

      Very skeptical

      I was very skeptical about how this thing worked but it was super simple to hookup and worked great have had it on now for a few months with no problems

      Helpful (7)
    • November 09, 2017

      5 2003 GT - RandyM Installation Time: Less than 1 Hour

      Quick, straight-forward install.

      I discovered that the 2003 GT Convertible I recently purchased had a rear gear swap from 3.27 to 3.73 based on the speedo indicating ~10 mph higher than actual speed at 60 mph (88 adjustment from stock required). I knew it was way off so checked it with a portable GPS. Install was well directed and easy to understand. Set recal. tool at 88 and matched GPS speed indication.

      Helpful (8)

    Questions & Answers (17 answers)

    5 Top Rated Questions

    Do I need this if I already have an SCT Tuner? The BAMA tune form has a section for tire size and gear ratio, so my question is leaning towards: Is it really necessary for me to purchase such an item when I can get a free BAMA tune for my upgraded 4.10 gears? It just doesn't make sense to purchase the re-calibration tool if a customer already has a Tuner... if that's the case then it should be in the product description so that people aren't mislead.

    • That is correct. If you already have a tuner, you can just get an updated tune to account for the change in gear ratio. No need to purchase this as well; you just need one or the other.

    Helpful (11) Show 1 more answer

    Will this work on 94 gt with 4.10 gears swap

    • The tool is compatible with your 94 GT with 4.10 gears.

    Helpful (0)

    2005 mustang gt going from 3.55 to 4.10 gears, video stated I will lose cruise control would this be to much of a drastic change for the ford performance calibration tool thanks

    • that is more than a 10% change.That is 2 steps up. You would have to go with 3.75 gears to use the tool still. 

    Helpful (0)

    I have a 1995 mustang gt, I made a swap with a t56 6 speed 03 cobra, but when I plug the sensor the speedo reach 120 mph only in first gear, in second gear it goes all the way. what I know 94-98 have mechanical speedo, and the T56 has electronic speedo. will this fix my issue?

    • The correct fix for this will depend on which version of the T56 you are using, however the Ford Performance Speedometer Recalibration Tool will typically not be able to correct for this as the speedometer is mechanical/cable driven.

    Helpful (0)

    I have a 1994 Thunderbird with the 4r70w will this work with it?

    • We have not tested the Ford Performance Speedometer Recalibration Tool with vehicles other than Mustangs.

    Helpful (0)
    Post Your Question
    10 More Questions
    If i put 4.10 gears in my 06 mustang then in a couple weeks put frag radials on will I have to reinstall this or will this work for multiple times or would I be better off buying the Bama Tuner? 1 answer
    Will this work on a auto to manual swap?? I have a 1997 Gt with now a 2002 t45 trans. My speedometer just goes all the way max. Note: I’m still running on an auto ecu. Would I have to take off the automatic functions off first and then do the recalibration or I can do recalibration first and then turn off the auto functions. 1 answer
    I have a 1998 lincoln mark viii with 4.6 32v and a 4r70w trans. Putting in 4.10 gears, i am told I need a tune or it will not have the proper shift points. Could this device work for me? 1 answer
    After the transmission swap in my Cobra the speedometer is almost 120mph off. If I go around 25 the needle goes past 160. Could this tool potentially fix an error that large? 1 answer
    I have a 1999 GT 5-speed that the speedometer is not getting the signal through the computer because the previous owner replaced the '99 T45 with a '97 T45. Will this Speed Calibration Tool allow my older VSS style transmission communicate with my newer OSS style computer/speedometer? 1 answer
    OK, so if you have an 05-9 V6 with auto trans and upgrade to a 3:73 rear you have to buy a tuner to recalibrate the speedo? 1 answer
    Why are people having problems with this on auto transmissions , fixing to order 410 gear set and recalibration tool but don't wont problem. 1 answer
    on my 01 gt i have 3.73 gears,the speedometer is only 5mph slow, but the odometer is fast,it is adding 1 tenth mile more for every mile i travel,will this recalibration tool fix my odometer? 2 answers
    would this work on a transmission swap? I have a 3.8 98 ford mustang, 5 speed. The transmission in it is a late model The 99-04 V6 T5; 1352-260 tag number. when I plug the wire into the speedo plug, it reads way beyond the normal speed for each gear. will this speed cal fix my problem? 1 answer
    Can this be used to recalibrate for a 160MPH speedo overlay? 1 answer

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) Speedometer Recalibration Tool

    Tech Specs

    Will It Fit My Mustang

    • Bullitt - 01, 08, 09
    • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
    • Cobra R - 95, 00
    • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
    • GT500 - 07, 08, 09, 10
    • Mach 1 - 03, 04
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10

        Related Mustang Categories