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Scoot'in
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1,201 Posts
Discussion Starter #1
I have found out using my GPS that my speedo is 5mph slower. Would this mean I might have a gear?
 

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Like A Boss
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18,927 Posts
Not necessarily, my dad's 99 Expedition is like 4 mph slow according to the gps, but I can assure you that it doesn't have anything special like that, lol.
 

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4 cam 4 life
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2,825 Posts
Cause there is room for error. Your speedo is calulated off a drive gear and rotations. The gears have built in error in them. 99-up elec speedos are more accurate.

This is why when you change gears in a 98 lower car, the speedos arent exactly on everytime, the gears FRPP sells to correct the speedos arent perfectly matched for the gears you install.
 
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