| dennisamurphy | -- 11-30-2021 @ 9:40 AM |
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I found the available gear part numbers for my 37 Tudor in the 18-20 tooth range. However, I am unable to locate a site that will offer a gear tooth calculator for the EFV8. I recently replaced my (what I thought to be 4.11's) 3.74:1, 10 Spline Banjo Gears with a set of 3.25:1 Banjo Gears. All of the calculators on the sites that I have found indicate that there is no gear available for my 3.25:1 x 29" Tire OD (read 9am-3pm)., yet I am thinking that the 19 or 20 tooth (Green Ford Book 1941-42) Part numbers might be close enough in ratio, and available somewhere, any suggestions greatly appreciated. Dennis A. Murphy
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| 40cpe | -- 11-30-2021 @ 4:26 PM |
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You will need a smaller gear to speed up the speedometer. If you are still using the enclosed drive turtle, I doubt you will find one to correct your speedo readings. This company offers mechanical adaptors, I'm sure there are others. http://www.abbott-tach.com/Welcome.html
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| juergen | -- 12-01-2021 @ 7:23 AM |
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You mention that your tire size is 29 inches. The standard early Ford tire is a 6.00 x 16 with a 28.3 inch diameter (according to Coker) which is within 3% of yours (or an error of less than 2 mph at 60). Now the Ford V8 Service Bulletins 1932-1937 list the turtle sizes for the Ford rear ends. A 3.78 takes a 20 tooth turtle while a 3.54 takes a 18 t00th turtle. My notes say a 6.60 tire with a 3.78 rear takes a 19 tooth turtle. My guess is that you would need one with a tooth count less than 18 (17 or 16?) which doesn't exist. A mechanical adaptor as 40 cpe suggested is what you need. To determine correction factor I used GPS to hold 60mph and noted the speedo pointer. The manufacturer did the rest.
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