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Ford Performance Speedometer Recalibration Tool (94-10 All)

Market Price $174.99 You Save 13% ($23.00)
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  • Item 50139
  • MPN# M-4209ADPT-AC

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Features & Details

  • 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: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (1) Speedometer Recalibration Tool
Installation Info
Tech Specs
Will it fit my Mustang?
  • Bullitt - 01, 08, 09
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

People Who Bought This Item Also Bought

Most Helpful Reviews

Bang On

After going from 2.73 to 3.73, speedo was way off. After installing this speed dial and calibrating for my gears and different tires height, the speedo is now Bang On. Compared to a GPS, within 1 km/h ...

Read More
Helpful (1)

Ford Racing

This product works great I changed the gear ratio to 4.10s in my 2002 and it was off at least 20kph (i am in Canada) the only problem i had with this is that the instructions were for Sn95 (1994-1998) ...

Read More
Helpful (1)

Overall Rating 4.2 out of 5 stars
Read All 46 Reviews

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8 Questions / 8 Answers

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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.


Helpful (9)
  • 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.


Show 1 more 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?


Helpful (0)
  • Hi, For a 05-09 you use either this recalibration tool or a Bama X4/SF4 Power Flash Tuner Item# 101200G056 to correct your speedometer after installing a 3.73 gear set. Here is the link

    Chris J

Why are people having problems with this on auto transmissions , fixing to order 410 gear set and recalibration tool but don't wont problem.


Helpful (0)
  • You should not have any issues using this calibration tool on an automatic Mustang. This product has been updated and issues have been resolved.


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?


Helpful (0)
  • yes it will


Show 1 more answer Answer This Question

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?


Helpful (0)
  • That's what it was meant to do so I would say yes, some handheld tuners can also help calibrate speedometer's after gear swaps and tire height changes, etc.....


Answer This Question

Can this be used to recalibrate for a 160MPH speedo overlay?


Helpful (0)
  • jj281 Ford Racing Speedometer Re-Calibration Tool is designed for: 94-04 auto and manual transmissions. 05-10 manual transmission. 05-10 Auto transmissions are limited to a 10% ratio change up or down. If the speedometer it self and the Speedometer face plate/overlay are a matched unit. Then it is irrelevant. Duke7


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Customer Reviews (46) Write a Review

Overall Rating 4.2

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Performance Gain 3.32 3.3
  • Fit 4.384615 4.4

  • 4/5

    Installation Time: Less than 1 Hour

    May 14, 2015

    Ford Racing

    This product works great I changed the gear ratio to 4.10s in my 2002 and it was off at least 20kph (i am in Canada) the only problem i had with this is that the instructions were for Sn95 (1994-1998) mustangs and because i didn't catch that i ended up wiring to the VSS (-) cable because ford changed the colours but i highly recommend checking out Ford Racing Website for all the instructions for your year of your car other than a mistake that was really my fault this product works great if you follow the right instructions should take no more than an hour great product .


    Year: 2002 Submodel: V6 Calgary, Canada

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    February 16, 2014

    Bang On

    After going from 2.73 to 3.73, speedo was way off. After installing this speed dial and calibrating for my gears and different tires height, the speedo is now Bang On. Compared to a GPS, within 1 km/h at highway speeds. A little pricy but worth spending the extra.


    Year: 1998 Submodel: GT West Nipissing, ON, Canada

    Helpful (1)

  • 5/5

    August 03, 2011

    Great Product

    1995 Mustang GT 5.0 AODE This is a great product. The Ford Racing Speedometer Recalibration Tool works exactly as described. I installed mine in the engine bay near the firewall according to the alternate directions. I choose to solder everything and grounded to the shock tower. I have 3.73 gears and an unknown speedometer driven gear. To calibrate the speedometer I set the cruise on the freeway and compared the speedometer to a GPS (Iphone Dashboard App) and came up with a multiplier that way. This unit has very good resolution. You can get your speedometer exactly right. Very important if you have an automatic and want to re-tune your shift points as they are based on speed not RPM. Always confirm your grounds.


    Year: 1995 Submodel: GT

    Helpful (10)

  • 5/5

    June 23, 2011

    New gears? You need this!

    After reading some of these reviews, I was afraid I would waste my time & money on this item. I did some research prior to ordering, then after receiving the unit, I contacted Ford racing tech. The gentleman I spoke with made it a point to tell me to be sure to connect the negative lead straight to the battery! That piece of advice must have made the difference for me, because once everything was connected under the hood, my road test was spot on! I had installed a new 8.8 w/3.73 gears, moving from a 7.5 w/2.73 gears. I did the math, set the unit as instructed. The speedometer resumed it's correct speed readings, odometer was correct, without any oddities exhibited. Thanks AM for carrying this quality product from Ford Racing! Installation took about 1.5 hours to get a clean, unnoticeable addition under the hood. This is the only solution for 94-98 model cars. I like it for my '97!

    Patrick Smith

    Year: 1997 Submodel: V6

    Helpful (10)

  • 5/5

    Installation Time: Less than 1 Hour

    August 20, 2013

    Works as designed!

    I've read a few unfortunate stories about this product on the web, so I was a little leery of it. I ordered it anyway, as it seemed the best choice in terms of quality and reliability when compared to other similar products. Installation was a breeze in my 1997 GT after the wires were identified. It was installed under the hood near the firewall on the passenger side. Soldered all connections and grounded to the factory hood hinge ground bolt. This tool didn't seem to work during the initial drive. Speed readings were ridiculously high. I tried different calculations and settings, but nothing seemed to help. I began to wonder if my device was defective. After looking at the unit, I wondered why I assumed the unit was right side up in terms of setting the dials. There was no indication of what way was "UP" or "TOP". So I flipped the unit around and reset my dials. BINGO! NOW it was working! This was money well spent for me. Easy install, easy set up, quality product, works as designed!


    Year: 1997 Submodel: GT

    Helpful (3)

  • 1/5

    February 26, 2011

    2002 Mustang GT Auto - Did Not Work

    Installed as directions stated. Direction stated that when dials are all at "0" that speedo would show 45, mine showed 25. For 4.10 gears, set the dials to 080. Driving down the road, would fluctuate from actual speed. Speedometer needle would not just stay at the actual speed. Shift points no longer worked, would not shift correct. Would almost have to blow the engine before the transmission shifted to the next gear.

    Jason Rogers

    Year: 2002 Submodel: GT

    Helpful (12)

  • 5/5

    January 22, 2011

    Speed Cal works

    Works just as advertised. Simple installation, but directions don't state that you need to open the black box to access the 3 calibration dials. Beyond that, great product and recal'ed my speedo perfectly after 3.73 gear install in my 96 GT.

    Tre, 96 GT

    Year: 1996 Submodel: GT

    Helpful (2)

  • 5/5

    October 14, 2010

    speedo recalibration

    after changing my rear gears to 4;10, I used your recalibration tool. Before using it my speed was off ten mph. after using the tool, it was right on. thanks for such a wonderfull product. & so easy to use too.

    Frank DeBilio

    Helpful (6)

  • 5/5

    May 20, 2011

    Too easy!

    purchased and installed the calibrator in my '00 Manual GT. I have many extras and as often as i change my setup from street to strip this tool is a savior. I used the under hood method at the 16-pin connector becuase it just didn't seem practical to crawl under the car everytime I needed an adjustment. With simple wiring tools, and a little common sense, very easy. took me about 15 mins from start to test drive. As always, great product, great shipping, great genuine Ford Racing Quality, great purchase.

    Josh S

    Year: 2000 Submodel: GT

    Helpful (3)

  • 1/5

    May 08, 2011

    another auto that don't work!!!!

    i read the reviews,everything went like the others said. followed terrible instructions,finally got it to make speedometer to work,but it only sat at 25. driving speedo jumped all over the place o/d light kept blinking and shift points were off. i'm glad i didn't solder things till i tried it. i dislike the vague instructions,i dislike the fact it don't work. i need my speedometer to work. somebody has to get busy and fix the problem this item has with automatic trans.


    Year: 2001 Submodel: GT

    Helpful (6)

  • 4/5

    Installation Time: Less than 1 Hour

    October 26, 2012

    Works 95 gt- t5

    It works perfectly now. Had to switch the green and white/yellow wires, I read where someone else had the same problem. No Big deal its dead on with gps.


    Year: 1995 Submodel: GT

    Helpful (1)

  • 5/5

    July 02, 2011

    A Must Have for Gear changes!!

    This item is a must have for any 94-98 Mustang needing a speedometer recalibration. I changed the rear end and gears in my '97 which caused a terrible fluctuation in my speedometer. Every bit of research I could do all suggested this tool to make things right. It does work! One tip the Ford racing Tech made about being sure to run the ground directly to the battery though made the difference. Took me about 1.5 hours to install under the hood, but I wanted it factory looking, so yours may not take as long. Speedometer is correct at all speeds now. AM folks were helpful with my questions and quick to get me the product. Another win product from American Muscle & Ford Racing!

    Patrick Smith

    Year: 1997 Submodel: V6

    Helpful (1)

  • 5/5

    October 14, 2010

    Speedometer Recalibration Tool

    The instructions should show detail of the dials to make the setup less confusing. Once understood, the tool is easy to use and works as advertised.

    James Premick

    Helpful (3)

  • 4/5

    Installation Time: Afternoon

    May 19, 2012

    Works well but beware.

    The unit easily recalibrates the speedometer. However, it affected my cruise control.


    Year: 2008 Submodel: GT Michigan, USA

    Helpful (0)

  • 1/5

    June 14, 2011


    This calibrates the speed properly as long as you're driving. At idle the speed jumps all over the place (even up to 150mph) adding mileage to the odometer and ruining the speed adjusted volume feature on the radio.

    Andreas B

    Year: 2002 Submodel: GT

    Helpful (0)

  • 5/5

    August 15, 2011

    Speedometer Recalibration Tool

    Installed the Speedometer Recalibration Tool which corrected the speedometer, but the transmission shift points were not working, the over-drive flashes on the instrument panel. Not recommended to get this product for the automatic transmission 2006 Mustang GT with the 4:10 gear change.


    Year: 2006 Submodel: GT

    Helpful (2)

  • 1/5

    April 03, 2011

    Didn't work correctly

    Had a shop install calibration tool but when I left the shop whenever I came to a stop or the car was just idling the speedo needle would jump up and down. this caused the odometer to keep running when the needle was bouncing... Took off and bought Tuner from American muscle... Would like to return calibration tool if I could..

    Ken Fugate

    Year: 2002 Submodel: GT

    Helpful (0)

  • 5/5

    December 17, 2010

    mustang gears

    its aight

    drake castaneda

    Helpful (0)

  • 5/5

    September 09, 2010

    great costumer service

    I never could get the ford speed cal to work right. American Muscle payed for return shipping and gave me a full refund. Will do businees with them again. Will probably just buy a gps from walmart that show speed and miles for about half the price of a speed cal.


    Helpful (5)

  • 1/5

    July 04, 2011

    Dont buy this item

    Do not buy this item i did and found out once i got my car retuned that it inter feared with the tune. It wasn't until the shop removed this device that my car was able to be tuned properly.

    Ben Atkins

    Year: 2005 Submodel: GT

    Helpful (1)

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