What do you want to know about it? If you want to know ratio just block one half shaft and mark the gear, see how many rotations to get the gear a full turn. Numbers like 3.36, 3.54, 3.7, 3.9, and 4.11 should come to mind. Also is the buldge of the housing offset to the drivers side if so it is an r200 if not it is an r180. Another way to count it out is simply to count ring teeth divided by pinion teeth. Any way if you were hoping for LSD i doubt it, no vented cover, open it up and check it out though.