Tire size change and speedometer

[gbadger]

Sooo… have a dark horse base. Got 305/19/30 square on the car now and the speedometer is off, which was expected. Went to Ford to have them reprogram tire size, which should be simple, and they tell me Ford “took their access away to do it” and I would need to get an aftermarket programmer

1. this seems asinine but whatever, especially since this is the tire size on the handling package

2. Is this accurate? Or was this tech wrong?

3. What is everyone else doing or has anyone else found a product that works? It seems crazy Ford locos you into whatever tire size the car was purchased with.

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[robvas]

Try another dealer, or do it with Forscan

 

[gbadger]

Thanks I will give Forscan a try.

 

[A.alansari]

I think @roket have a calculator ready to give you the exact numbers you need to use in forscan for this if I'm not mistaken

 

[roket]

I think @roket have a calculator ready to give you the exact numbers you need to use in forscan for this if I'm not mistaken

yep
https://roketgamer.dev/mustangtools

 

[hoodscoops]

Sooo… have a dark horse base. Got 305/19/30 square on the car now and the speedometer is off, which was expected. Went to Ford to have them reprogram tire size, which should be simple, and they tell me Ford “took their access away to do it” and I would need to get an aftermarket programmer

1. this seems asinine but whatever, especially since this is the tire size on the handling package

2. Is this accurate? Or was this tech wrong?

3. What is everyone else doing or has anyone else found a product that works? It seems crazy Ford locos you into whatever tire size the car was purchased with.

Do you have pics? A non-HP DH with that tire setup would have a huge wheel gap. Unless you lowered it

 

[gbadger]

Do you have pics? A non-HP DH with that tire setup would have a huge wheel gap. Unless you lowered it

I can get them later when I’m home but it has steeda suspension work (dual rate handling springs, camber plates, etc) so it is lower.

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