Speed Calibration!

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mustangGT_00 - 15 Feb 2007 12:01 GMT

Good day guys,
I got 4.10 gears installed in my 00 GT. The speed odometer is not reading
the actual speed. I know SpeedCal is the needed thing in here, but I'm
just too busy with school and work. I talked to some people and it seems
like I need an expert to talk to. Can any one help me with tips about this
part (function, price, installation, etc..). Your help is appreciated.
I Mak

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Les Benn - 15 Feb 2007 17:16 GMT

There should be a speedometer calibration shop in your area. Probably used
by the local police too. I was told last time I had an issue with
calibration is to drive a measured 10 mile distance then note what your
speedo reads, using the difference they can put in the needed pieces parts
to make it read accurately.

> Good day guys,
> I got 4.10 gears installed in my 00 GT. The speed odometer is not reading
[quoted text clipped - 3 lines]
> part (function, price, installation, etc..). Your help is appreciated.
> I Mak

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My Name Is Nobody - 15 Feb 2007 21:07 GMT

> There should be a speedometer calibration shop in your area. Probably used
> by the local police too. I was told last time I had an issue with
> calibration is to drive a measured 10 mile distance then note what your
> speedo reads,

This method requires using your ODOMETER and is limited to the smallest unit
measured by the odometer 1/10th of a mile degree of accuracy, combined with
the operators level of accuracy. Basically ok as a ballpark indicator...

It is much easier to look up this already "know information" or go to
someone who already knows it.

Is it a simple computer recalibration? Or are you going to pull your
transmission and change speedometer gears? Or are you forced to choose to
live with the discrepancy?

> using the difference they can put in the needed pieces parts to make it
> read accurately.
[quoted text clipped - 7 lines]
>> part (function, price, installation, etc..). Your help is appreciated.
>> I Mak

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Les Benn - 16 Feb 2007 16:40 GMT

correct I meant to say odometer. The reason for the 10 measured miles is to
get closer to cut down on the error since most odometers read only in 1/10
of a mile. If you really want better do it over a longer distance.

>> There should be a speedometer calibration shop in your area. Probably
>> used by the local police too. I was told last time I had an issue with
[quoted text clipped - 25 lines]
>>> part (function, price, installation, etc..). Your help is appreciated.
>>> I Mak

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Spike - 17 Feb 2007 02:19 GMT

In my case, I changed the tire size from 14" to 16", and now, the
speedometer reads about 50 when I'm flowing with city traffic in a
35mph zone.

Anyway, when the cable was pulled to put in a new gear, it broke off
in the tranny. Waiting on the new cable now. Then I have to go through
it all again. The rear gear "seems" to be 3.80 or 3.89.

One place where GM had a better idea... cable goes from the tranny
into a box of gears then out to the speedo. Lots of possible gear
combinations in that box.

>> There should be a speedometer calibration shop in your area. Probably used
>> by the local police too. I was told last time I had an issue with
[quoted text clipped - 23 lines]
>>> part (function, price, installation, etc..). Your help is appreciated.
>>> I Mak

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