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.

On Thu, 15 Feb 2007 21:07:56 GMT, "My Name Is Nobody" >
wrote:

>
>"Les Benn" > wrote in message
...
>> 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.
>>
>> "mustangGT_00" > wrote in message
>> lkaboutautos.com...
>>> 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
>>>
>>
>>
>