This is the best gear calculator I've found, at the top there is a link to the metric version
This calculator gives speeds & ratios for your transfer case in high & low range as well as options for adding a under drive
http://www.grimmjeeper.com/gears.html
Clockwork Orange 1983 CJ8 work in progress,
Red 2009 JKU Auto V6
Sprintex Super Charger from JeepFord