Well according to the gear calculators on the internet with 4.30's you'll be maxed out at 6K at 106.6MPH.
In my car with 4.10's I would cross the traps at 5400RPM in 4th. That is going 104-105. With 4.30's I'm crossing the traps at 5700-5800RPM in 4th going about the same speed.
NA though you don't want to be going through that high and RPM in your car because your power band drops off much quicker than mine does.
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