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Try out the metric calculator
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This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations.
Disclaimer: This form is only to be used for estimation purposes. Exact results of combining equipment may vary from the estimates provided in this form. The data provided here is done so as-is with no warranty expressed or implied.
Note: This calculator is continually being updated. The lists of available equipment will probably never be complete. If you find that the parts you would like to use are not yet listed, please send the information to me and I will do my best to include it as quickly as possible. It has come to my attention that my grimmjeeper.com email address doesn't always forward mails to my real address. So here's one that hopefully works a little better: firstname.lastname@example.org
Detailed Instructions Here
If you're going to regear your 4x4 it's a good idea to consider adding a locker or limited slip differential at the same time. If you're having trouble figuring out which one is for you, I've written an introdution to differentials and lockers to help you decide.
If you are wondering what all of this gearing talk is all about, I've written up an introduction that walks you through The basics of gears and why you would want to change them.
BETA: Calculate your new mechanical speedometer gear here
There are two copies of the form so that you can do a side-by-side comparison of two combinations.