What should i do to correct speedo for 4.10s???
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Old March 1st, 2008, 09:28 PM   #1
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What should i do to correct speedo for 4.10s???


I have a set of new ford racing 4.10's ready to be installed. I have a used sct x2 tuner than i need to get tuned but am told that i will not be able to use that because of the year car i have. I guess anything older than 98 has the options of a speedo gear, or a speedocalibrater, not even sure about this one. I have read that a speedo gear will not 100% recalculate for the gears... I am not even sure what tooth is needed for 4.10's. Does anyone know what tooth is needed for 4.10's in my car and what mph it will be off... And does anyone know about using a speedcalibrator for a 97? What should i do?
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Old March 2nd, 2008, 12:07 AM   #2
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STEEDA part number

392-STE-17271-D
Manual 8-Tooth 4.10 Ratio / White 23 Speedo Gear $15.95

Speedometer Recalibration Gears - '79-'98 Ford Mustang
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Old March 2nd, 2008, 11:02 AM   #3
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Will my speedomter still be off by alot with this, i was told it will be off by like 6+.
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Old March 2nd, 2008, 04:10 PM   #4
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Not really, no. I never had a problem. I guess you could run into one if you are doing around 140mph or so. Buy the Steeda gear.
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