Who can help me figure my RPM's??

Ok so a 347 with about 400 hp, 3 speed auto, 2500 stall converter, and sadly im not sure what the tire size is in the rear... you can look at my picture and guess but thats all i got maybe 25 inch diameter idk... If I was cruising at about 70 mph on the highway 3rd gear, what would my rpms be

 

http://www.wallaceracing.com/Calculators.htm
Use your tire size to find the approximate diameter.
And you need your rear gear ratio.


And when you are done... you can work out your RV loan.

 

thanks...
I was wondering what a 1" shorter tire would be RPM wise at 80 MPH...(88 RPMs)...
...

 

Without a lockup converter(which C4, C6, etc doesn't have), you can count on a 200-300 RPM higher figure at highway speeds vs what is calculated...