finding the right gear ratio ?

pyrojim said
I have the same problem with the speedo in my 71 Dart. 14 to 15 inch conversion. How do I find which is the correct gear and where can I get one???
Thanks

This link should help you figure out which gear you need.
I have a few gears let me know which gear it is you need after looking at the list.

http://www.mymopar.com/speedometer.htm