Figuring out RPM's

[Viggen]

I know how to figure out the revs using speed, tire dia and trans and diff gearing but how do you figure it out when its a Rover and theres additional gearing from the transfer case?

 

[Antichrist]

I think this will do it:
http://www.4lo.com/calc/gearratio.htm

There was another one I had bookmarked (on a dead computer) but google turned up the one above that looks like it will do the trick.

 

[Viggen]

Perfect! Thats what I was looking for. I know how to figure it out with a traditional transfer case but didnt know what adding additional gearing through the transfer case does to the math equation.