i used the front range offroad kit. i dont know what there hanger was. 31.5 sounds right though. you can use a toyota axle if you want i just didn't want to have to get a new tranny and transfer case to make it go to a yota axle. i run 38.5s with my waggoneer with chromoly shafts and haven't had a problem. its just what ever you find and feel like working on.