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Old 12-08-2008, 05:50 PM
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Marcelo Marcelo is offline
Dodge Ram Forum Senior Member
Join Date: Dec 2008
Location: South America
Posts: 196
Gender: Male
Vehicle: 2005 5.7L HEMI
Trim Level: SLT Quad Cab 4WD
Color: Flame red
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Default How to correct speedo excess error?


With the aid of a GPS, I managed to detect my 2005 RAM has a +15% speedometer error due to the bigger tires (37" Goodrich). Those 5" extra diameter against the 32" stock make that speed difference. I assume speedo takes a signal from some shaft inside the transmission and has a conversion factor set for standard 32" wheels.

Do you have an idea about what could I do to correct this? I know some Jeep user change a teethed-cog that directly couples the speedo cable, I don't know if there's an equivalent in our machines

Any advice welcome...
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