Pretty easy to find around here. Usually around $75-100 will get you one. Make sure you get one with the "ring gear deflection snubber". It is an external screw & jamb nut on the left outside of the case. It has a pad on the inside that rubs on the ring gear under severe load ( like when you try to get the motorhome to do a wheelstand) hee hee! Some have it, some don't.