Speedometer is not accurate

[eloney1]

Part# U7153, Revision 9r03, 2001 Ford F150 4.6L

Here is the problem, I have had this programmer for four years and it has worked great till I updated to the 9r03 revision. Now the speedometer is showing about ten miles an hour to fast with the new revision what should I do? I can`t get the July-24-2004 revision that was on it when I bought it to try it again, so I am stuck with a truck that is stacking miles quickly and the possibility of getting a ticket from not knowing my accurate speed. Thanks for the help.

Eliot O Loney

[greg1225]

did you ever get resolution for this?

[mikel]

Try changing the tire revs per mile to the correct setting for your tires.

[eloney1]

No I haven,t figured it out yet, I have 315/70/17 tires on the truck and I set the revs on the programmer to 587 but it is not changing it to the proper speed

[Vapor7]

On this thread....... Is it more accurate to program the tire size or the axle ratio if you are running stock size tires?