Tire size change, easy one

[Ryanhnt]

Hey guys, long time no questions but I have a simple one now, what do I do with my pred 7145 to change my speedometer for my change of tire size? Thanks Ryan 2007 Mustang GT I have the latest update 9 something

[Phil]

When you get to the install/modify tune heading choose modify tune. Then go to modify parameters. Scroll down and choose axle ratio. Then go to REVS per mile. Take a measurement in inches from the ground to the top of the tire. Take the # 20168 and divide it by the measurement you come up with. This will give you your REVS per mile.

[Ryanhnt]

So I don't have to look all over, What is the axel ratio for a 2007 gt s197 manual transmision rear axel? Thanks for all your help.

[lito]

3.31