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John, where does the speedometer pick up its signal from? If i remember right on old 911s it used to be off the ring gear?
thanks carl
GT4 gets the data from the wheel speed sensors. You're correct, back in the day you change the final drive it throws the speedo off. I went from a 3.42 to a 3.89 on my '98 Z28 and was off by 7mph. Not the case on the GT4, realistically only the OD of the tires would throw the speedometer off