How can I change a 80mph speedometer from a 79 Ford Ranchero to a 120 mph?

Asked by Mar 21, 2017 at 03:12 AM about the 1979 Ford Ranchero

Question type: Car Customization

I tried replacing the speedometer with one from a 76 Ranchero but it didn't work. I need to know the transmission speedometer drive gear ratio for a 3 speed automatic. What color for the drive gear & for the driven gear (I don't know if that's the right term. but I think there are 2 plastic gears involved)?

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