- Jun 20, 2001
- Valrico, Fl.
- 1969 Triple Black Convertible: 2014 Crys Red Conv
I have just changed from a 4.11 to a 3.36. Using the toolbox calculator @3500 rpm my speed has went from 70mph to 85 mph. Problem is the speedo is way off. Looking in the parts catalog, I can get drive gears anywhere from 18 to 25 teeth. Which one do I need?? I don't know which one is in there now, but the speedo was acurate with the 4.11. Anyone have any ideas?