smoloney,
I have/will use all of these:
- original 1954 3-speed, 1:1 3rd gear
- SM420 4-speed, 1:1 fourth gear
- Hydra-Matic 4-speed, 1:1 fourth gear
Approximately 31"-31.5" loaded-diameter radial light-truck tires.
My speedometer is calibrated and has less than 1% error at 60mph.
2575 - 2616 RPM at 68 MPH, unless I am using that calculator incorrectly?
Why do you ask?
