Reseting Speedometer on 2000 GT

[doubleomustang]

i just had a 3.73 gear installed in my 00 GT. it threw my speedometer off by about 10 mph. the garage that did it said there was no speedo gear to replace. they said that it was electronic and that i needed to find the codes online to reset the speedo....like turning the ignition on and off several times in some sort of order.
Can anyone help with these codes?

 

[Duke309]

you need either a speedcal (doesnt work on an auto), or a tuner such as the sct xcal 2 or diablo predator.

 

[SaleenGT2001]

sorry, no such thing as codes to reset it.

you will have to either have it tuned or buy a hand held tuner to adjust the speedometer.

till then you can unplug the speed sensor if you have a manual trans to keep the miles from racking up

 

[doubleomustang]

i dont think that the odometer is registering more than what is being put on it. is it true then that this year does not have a speedo gear in it.

 

[Duke309]

the odometer is not putting the correct number of miles though, yeah its true that you cant just change a speedo gear on your 2000

 

[SaleenGT2001]

his odometer is going by what the speed sensor is saying that the car SHOULD be doing with 3.27 gears. now that the gears have changer his speedo is fast which makes the miles rack up faster.

 

[Matt's 03 GT]

The 99+ mustangs have an electronic speedometer. You will need an x-cal or similar to make the adjustments.

 

[doubleomustang]

yeah i found out there isnt a gear to change its all electronic....the odometer is reading right ....

 

[Matt's 03 GT]

If you haven't changed the computer to recognize the new rear gears then you spedo and your mileage will be reading incorrectly.

 

[doubleomustang]

i have run the car against other cars and tho the speedo is off the odometer still reads correctly. just got a ticket...gota get that thing fixed

 

[LaserRed01GT]

i have run the car against other cars and tho the speedo is off the odometer still reads correctly. just got a ticket...gota get that thing fixed

It's physically impossible for both your speedo and odometer to register correctly without changing the rear axle ratio within your PCM.

Assuming you kept the same size rear tires and going from a 3.27:1 gear to a 3.73:1 gear, you are accumulating mileage at roughly a 14% increased rate. Your speedo is also increased by roughly the same. So if your speedo shows 70 MPH, you are actually only doing about 60 MPH.

 

[joshheat25]

Yea just spend the money and buy the Excalibrator 2