speedometer reading high where to start?
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New User
Joined: Sep 2010
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speedometer reading high where to start?
i need some help on where to start my speedo is reading about 5mph over under 50mph and about 10mph over 50 would like to fix this but dont know where to start anything would be appreciated 87 f250 6.9 na 2wd c6
Posting Guru
Joined: Oct 2005
Posts: 2,282
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From: Oregon
Need tire size, gear ratio, etc. I have the wrong speedo driven gear in my truck as well, but mine reads lower by about the same rate. There are calculators available online to find which correct gear you need.
