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Originally Posted by HIZNHRZ
- My math was correct. With the 4.10 and 3.90 ratios the gear ratio drop of the transmission's 6th gear causes the engine speed to drop below the peak power band. Thus the car is RPM limited to top speed in 5th.
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5th is .75:1 and 6th is .5:1. So shifting will cut the rpms by 1/3.
Regardless of the rear end ratio, a shift from 5th at 7,200 rpm will drop the rpms down to 4,800 in 6th. That's way out of the power peak for these cars, and I'd think you'd have to have gearing one heck of a lot higher than 4.10:1 to pull that off. So I think for all practical purposes 6th gear would not be a top speed gear unless you have some ridiculous rear end gears, or some ridiculous amount of engine.
If you want to try your 4.10's out on the strip, let me know. I'd love to go before they close for the season.
