So I bought my car and it has 4.10 gears. The previous owner had a Abbott ERA Speedometer Calibrator installed on the car already and the speedo was perfect. I just installed a SCT Livewire Tune and under the personal options it asked what size rear end gear I had. I put 4.10 in and downloaded the tune. I ttok the car out today and it seems like the speedo is off by 10 mph or so. I will be flying by people and it will say I am doing 30 mph in a 35 mph mph. Wondering if anyone ever had this happen. I think I tricked my car. It seems like the speedo calibration was done twice now. Tomorrow I think I will try and take off the SCT spped calibrator on the tuner and put it back to defalt format. Any help would be appreciated before I try this tomorrow night. Thanks
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