Engine RPM Calculator

This looks like a good tool to use. I don't know what Mark VIII's transfer case final ratio is though.
http://www.powerblocktv.com/calculators/

The Mark 8 doesn't have a transfer case. Leave the ratio as 1:1.

That's pretty kool but is it accurate I wonder.

It's as accurate as the information you feed into it. It's a simple enough calculation to do by hand. That calculator doesn't take the reduced diameter of a loaded tire into consideration, unless you correct for that yourself.

CliffyK has a better "real-world" calculator on his page under the calculators tab.

http://www.paladinmicro.com/pmicro.php#
 

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