Outer Limits 4x4 Board

I have a diff centre out of a 2wd lux. How many teeth on the crownwheel for what ratio?? thanks guys.

edit...

didnt read your question properly..

Count the teeth on the crown wheel then devide by the teeth on the pinion and thats your ratio eg 37 div 9 equals 4.11:1

Wally

Thanks wally

or if they are factroy gears the ratio is often stamped on the outer edge of the crownwheel. If you know where the donor vehicle is you could also read and decode the diff code off the build plate.