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Synchro909,

You are on the right track. The 16 - 17 % error indicates to me it may be a combination of the drive gear and air gap. Air gap usually is a 5 to 7 mph maybe a little more adjustment. And like you said it is a trial and error process.

Let us know how it works out. I will watch for your results and provide any appropriate advice.

I am sure you are dealing with an oval speedometer as the depression resulted in very few late 30 or 31 Model A Fords being imported into Australia.

My wife have been to several meets in AU, Shannons 2001 Canberra, and the Model A meets in Toowoomba 2002, Adelaide 2006 and Launceston 2010, and have always enjoyed the meets and the friendships.

good on ya mate!!