Can your Speedo be recalibrated like this?

[AFJuggalo81]

I'm getting my 4.10 gears put into my 2003 Mustang GT - Auto Tomorrow and the guy who is doing it said he could fix my speedo by I guess adding a gear/ counting the teeth (every tooth is 3mph) then he is gonna see how many times my tires turn in revolution in a mile to adjust my speedo. Does anybody know or have heard of anything like this?

 

[HoustonGT]

I'm getting my 4.10 gears put into my 2003 Mustang GT - Auto Tomorrow and the guy who is doing it said he could fix my speedo by I guess adding a gear/ counting the teeth (every tooth is 3mph) then he is gonna see how many times my tires turn in revolution in a mile to adjust my speedo. Does anybody know or have heard of anything like this?

This was on the pre-99 Stangs. The newer ones are contolled electronically, so you will need either a chip or a speedcal to correct the speedo

 

[COramprat]

Your speedo is electroninc. You will have to get the computer flashed to get the speedo correct.

 

[COramprat]

This was on the pre-99 Stangs. The newer ones are contolled electronically, so you will need either a chip or a speedcal to correct the speedo

Aww...you beat me

 

[StangLou]

Nope, cant do that to an 03 We have to get a speedcal, or a chip

I hate it when I get beat by like 2 or 3 people to post the same answer lol.

 

[cold96snake]

I hate it when I get beat by like 2 or 3 people to post the same answer lol.

Dammit, you beat me to it.

 

[Firemanz]

I'll say it again, speedcal, chip, or ECU reflash......

 

[HoustonGT]

HAHA! I t3h OWN all. I posted first.