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I am going with 4.56 gears, I have a AOD automatic, just wandering what rpm you are running with 4.56's and say 33" or 35" tires. Thanks
 

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I have the E4OD and 302. With my 4.56 gears and 35" tires 70MPH is right at 2200RPM. Hope this helps........
 

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Engine RPM = (Speed * Transmission Gear Ratio * Final Drive * 336) / Tire Size

Example:

RPM = (70 * .67 * 4.56 * 336) / 33
RPM = 71858 / 33
RPM = 2177

Or 35" tires

RPM = 71858 / 35
RPM = 2053
 
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