Hi Jim,
Do you know how fast your speedometer is? When you do, divide the actual
speed by the indicated speed. Then multiply this by 15 and you will know how
many teeth you should have.
For instance, 60 MPH / 50 MPH X 15 teeth = 18 teeth
You will have to pick a gear as close as possible. Most Ford dealers have
gears. Take your old one to make sure the lengths and diameters are the same
and the "Lay" of the teeth are the same.
You can do your testing after you get the car running to get some good
measurements. To make calculations easier and correct for tire growth, etc.,
test at an indicated 60 MPH.
John Logan
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