Assuming a diameter of 26.4 inches for a P225x70/14 tire
https://www.differentials.com/techni...io-calculator/
I get 3000 engine rpm at 60 mph for a 3.73 ratio;
3300 engine rpm at 60 mph for a 4.10 ratio.
I suspect that does not comprehend auto trans converter slip, etc.
What kind of rear end? That will affect our library of available discreet rear axle ratios to choose from.
K
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.85 @ 136 mph best
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