Having trouble attaching an excel file that I made, so if you would like the calculator, just shoot me a PM with an e-mail address! (The file has tabs with both standard and metric scales.) I'm considering going from the factory 3.91 front and rear differentials to the
Performance Gearing 4.44 front and rear (limited-slip) differentials. I wanted to know what cruising speeds and etc were, so I did some chicken-scratch math on a cocktail napkin. Here are screenshots of the data:
4.6iS OEM Tire and OEM 3.91 Differential Gearing
4.6iS OEM Tire and "Performance Gearing" 4.44 Differential Gearing
Now I'm really interested in those 4.44 front and rear differential gearsets.
- J