Originally Posted by
jarod17
Time to learn something new. (for me anyway)
So the PSOM is in the speedometer and is not the VSS that is located in the rear axle housing?
All the other vehicles I have had or worked on had the cable driven speedo's so this is new to me.
Sorry jarod I hadn't seen your post till now. Been up at the cabin for a few days.
Anyway yea the PSOM is in the speedo cluster. It allows for 6 changes to be made for tire size. After that a ford dealer needs to be involved but what exactly they do I have no idea.
946 was the magic number that worked for me, is within 1mph +/- at any given speed to what my wifes Explorer reads so I will leave it at that.