tire and ratio change....speedo?
#1
03-16-2007
Join Date: Feb 2007
Location: Raleigh, North Carolina
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tire and ratio change....speedo?
I originally has 235/75/R15 and 3.73
By the end of tomorrow, I will have 31s and 4.10
How the heck does this make the speedo change? I have seen the tire change effect calculator on TRS, but nothing about changing gears... What will happen with both being changed? What can I do to correct this on my 1999?
Thanks
By the end of tomorrow, I will have 31s and 4.10
How the heck does this make the speedo change? I have seen the tire change effect calculator on TRS, but nothing about changing gears... What will happen with both being changed? What can I do to correct this on my 1999?
Thanks
#2
03-17-2007
Originally Posted by therangerofdanger
I originally has 235/75/R15 and 3.73
By the end of tomorrow, I will have 31s and 4.10
How the heck does this make the speedo change? I have seen the tire change effect calculator on TRS, but nothing about changing gears... What will happen with both being changed? What can I do to correct this on my 1999?
Thanks
By the end of tomorrow, I will have 31s and 4.10
How the heck does this make the speedo change? I have seen the tire change effect calculator on TRS, but nothing about changing gears... What will happen with both being changed? What can I do to correct this on my 1999?
Thanks
Tire diameter changes do cause speed errors though. For your 99, the speedometer correction is done in one of 2 modules depending on which ABS you have:
RABS: correction done in the GEM
4WABS: correction done in the 4WABS Module
Ford dealers have the special tool to access these modules.
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