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Old 04-03-2015, 03:17 AM   #1
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Gears

So ive notice today that my car marks 80mph but on my gps marks 68mph i set it at cruise control at 80 and its seems its off by roughly 12mph could it be that the previous owner changes the gears and how could i fix it to mark the correct speed any idea on the gears it may have


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Old 04-03-2015, 05:38 AM   #2
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It could also be from a change in the overall rim/tire size if those were played around with.

One of the easier ways to get an estimate on your gear ratio is to go look at the speed/rpm chart on American Muscle and see which one matches your conditions.


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Old 06-17-2015, 03:04 AM   #3
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Quote:
Originally Posted by Kstangs2002 View Post
So ive notice today that my car marks 80mph but on my gps marks 68mph i set it at cruise control at 80 and its seems its off by roughly 12mph could it be that the previous owner changes the gears and how could i fix it to mark the correct speed any idea on the gears it may have


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on the drivers side there is a sticker on the bottom that tells u
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