Kind of related to the subject of 'how low in RPM'...

Does anyone have a good tire/axle ratio/rpm-mph/ tranny calculator?...

I used to have a real good one that came on an excel spreadsheet that you entered in your tranny gear ratios, your rear ratio, and your tire profile- then it would kick out the tire diameter/width/circumference, the speedo gear teeth count needed(late mopar), and two charts showing rpm at mph in 10mph sections then mph at rpm from 1500-8000...

Unfortunately I'm not sure where I downloaded it and the poor spreadsheet has now corrupted and I don't hve a back up...

Anyone have a nice useful tool like this or a link?

Thanks,

-D.Idiot

http://www.moparts.com/Tech/tech/pages/speedo.html has a seperate excel sheet for auto and manual trannies.

Thanks Pierre!

That's a great tool for guys playing with gear upgrades, axle swaps, and 'what if'... good way to check calculated rpm when recurving distributors or wondering why your mileage is off.




-D.Idiot