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Discussion Starter · #1 ·
i have cracked a formula to accuratly tell you what your engine rpm would be going 100km in direct drive with your current gear ratio and tire size.


(((100/60)*100000)/(3.141592*(tire size in inches*2.54)))*current diff ratio

you can get rid of the tire size in inches if you know it in cm
to find out what it would be in your over drive gear aka your final gear times it again by that ratio, the 48re is .7 i believe.
i hope this helps all this is a secret from a former company that i wasn't suppose to leave with.
 
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Dodge speed calculator

Not to rain on your effort but here is one heck of a spreadsheet a dedicated fellow named Klenger put together and published on the web.

http://www.klenger.net/dodge/general-reference/gear-speed-calculator.pdf

I hope I'm not violating any forum restrictions posting this but I thought it was a valiant effort on his part to do this. Just fill in the parameters to get speeds in any of the gears on any transmission you have. you'll have to scroll down to get to all the transmisions he listed

He had a number of helpful links at the "klenger.net" page as well
 
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