gear ratio..??

[WILMASBOYL78]

225 x 70/14 tires....60 mph is 3200 rpm in high gear

what is the rear gear ratio?

thanks..wilma

[Keith Seymore]

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

[WILMASBOYL78]

it is a 12 bolt chevy in a 69 camaro...muncie 4 spd.

thanks

[ssl78]

I would say 4:10 I have a 4:10 in my Camaro with F70x14 and I do around 32000 at 60 mph

[Keith Seymore]

Originally Posted by ssl78

I would say 4:10 I have a 4:10 in my Camaro with F70x14 and I do around 32000 at 60 mph

That's spinning it pretty fast.

K

[mssl72]

32,000 RPM!! That is hauling!