Quote:
Originally Posted by Pat68HO
You're right, John... something just doesn't add up. I have 235/60-15 tires (26.1" diameter) and 3.55 gears ("WH" stamped on the rear axle). According to the calculator, I should be turning 3200 rpm at 70 mph. I think the speedometer is close enough because when I keep pace with the traffic on the interstate, it is showing 70 mph give or take a couple of mph. I have hood tach which I don't think is the original... has there been any problems with the accuracy of the reproduction units?
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Wouldn't hurt to have a GPS confirming your speed either.