Tire size gear ratio calculator

[dfark]

I was browsing the front end kits from Reilly Motor Sports and found they have a neat  speed/tire size/gear ratio calculator.   I found it to be very helpful so I just thought I'd pass it along     http://www.reillymotorsports.com/store/pages.php?pageid=12    .   If that don't work it's in the help section in the left task bar of their web page.  Have a good day

[Chryco Psycho]

This is the Mopar themed one I generally use http://vexer.com/automotive-tools/speed-rpm-calculator

[nqkjw]

I use this one from Moparts.

http://www.moparts.org/Tech/tech/pages/speedo.html

then select auto or manual