Just picked up a new Edge Evolution programmer. I have 305/70 R17 tires and I'm trying to recalibrate my speedometer through the programmer. According to the manual I have to not only adjust the tire size ( which I have done ), but also the gear ratio. The default for my truck is 3:55. Any suggestions?

 

Contact Edge customer support. They will be able to help you out.

 

Thanks. Sent them an email. They suggested calling ford with the VIN to get the right ratio.