Did you install the Lock Right yourself or did it come that way? There is a procedure in the manual for testing. Put jeep in gear. Jack up both rear tires and support with jack stands. Have a helper help you turn both tires forward till they lock (come to a stop). Have him hold his tire forward while you turn yours backwards. It sould click then. Then both forward again then you hold forward and he'll turn backwards. Than reverse the whole procedure starting backwards.
'91 YJ,I-6,2.5" lift,Boomerangs,33s,D30,D35c,Lock-Right F&R and a light foot