Speedo Calibration
06-03-2008, 09:30 PM
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Speedo Calibration The stock 3.23 diff shot the bed. A friend gave me a 3.90 complete since he added a 9 inch. Can I use a Tech II to change the gear ratio or do I need a tuner program. Car is a stock driver, no mods.
06-19-2008, 10:16 PM
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Dont know if you can change it w/ a handheld. But get someone to tune it for you. It takes a change of exactly 20% on your speedo. That will put you dead on. It is done by %, not mph difference.
