69 440-4-speed Swinger.

3.23 is a good street gear, I had them in my 69 dart 440 4 speed and took them out for 3.91's. The 3.23's are going right back in. 50-55 is the max I dare run with the 3.91's as she is screaming. I have no tach so can't tell you what my rpm's are but I know its to much for constant running.