easy way to tell between 2wd and 3dr hubs.

2wd hubs use a pinch bolt system for the TCA joint. (so the bottom part is split)
3dr hubs use a castle nut for the TCA (so bottom part is solid)
4wd hubs will have a different drive flange as they need a drive shaft to go in them, so its pretty damn obvious if they have

Hope this helps.