Quote:
Originally Posted by low63gp
Guys,
I have found that my car speedp is running 95 mph at a true 70 mph and the tach is at 3200 rpm.
I think it is due to smaller tires. Does anybody know the calculation of gain in mph on speedo if I change fron 3:23 to 2:69?
It looks like that is what I plan to do. Im just wondering what my new true mph adjustment would be at 3200 rpm with that gearing increase.
Also, if anyone has a 2:69 from 61-64 I am interested if you are within 500 miles of Central California.
Thanks,
Mike
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Assuming your 70 MPH true number is correct and was taken at 3200 RPM with your 3.23, changing to a 2.69 rear gear would give you 84 MPH true at the same engine speed.