Looking for a tire/gear/mph/rpm calculator

I need to find out what gears i need to run in order to make it down the track shifting the car at 7k
I know there some kind of calculator out there

thanks

http://www.pszweb.com/car/gears.htm

http://www.geocities.com/z_design_studio/transmission_z28_6.html

Not to mention the one linked from the CamaroZ28 site - its a shame no one seems to use the resources we have right here:

http://www.camaroz28.com/calcs/index.shtml

Moving to "General........."