Hi Stangers,

I have a 66 coupe with a 9" rear with tags for indentification purposes.I am trying to find the gear ratio for this unit. I have turned the rear wheel one revolution and the driveshaft turns approximately 1 1/2 turns one one rev of the tire. I have also measured the flange to flange measurement and it come out as about 53". Any guess on the ratio would be helpful. I am trying to determine the speedo gear to put into this car???

 

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