How do I get my speedo correct? - Mustang Evolution

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Old 03-30-2014, 11:10 AM   #1
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How do I get my speedo correct?

I have a 98 with 4.10 gears.
When I first bought it, it was 15 to 20 mph fast
I changed the speedo gear (23 tooth)(I think the oem was 17) ( the one that plugs into the tranny) and that got it down to only being 5 to 10 mph off.
I have seen the speed cal and the ford racing calibrator and also the electronic one that tunes.
What is the proper way to correct the speedo?
Or should I just put the oem gears back in?
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Old 03-30-2014, 01:18 PM   #2
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4.10-F1150, 20tooth, black
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new engine,1.7 rocker arms,Pipes exhaust, shorty cats , shorty headers,under drive and overdrive pulleys,4.2 upper plenum, throttle body spacer, cold air intake, stage one clutch, shorty shifter, and tune. 8.8 in storage
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Old 03-30-2014, 01:27 PM   #3
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Maybe it was the 20 tooth that I used. I know this because it was the one that steeda told me to use. But unfortunately it's still off by about 10 mph
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Old 03-30-2014, 02:23 PM   #4
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There are three options---->EVERYTHING You Need To Know For Gear Swaps, Etc. - V6Mustang.com
American Muscle sells speedo gears
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new engine,1.7 rocker arms,Pipes exhaust, shorty cats , shorty headers,under drive and overdrive pulleys,4.2 upper plenum, throttle body spacer, cold air intake, stage one clutch, shorty shifter, and tune. 8.8 in storage
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