I wonder if you had a thrust washer break maybe, that lead to your problem.
also did you check the tolareces whe you installed the lock rite?
As an additional check to be sure that everything has been installed correctly, use a small ruler, vernier caliper or blade type feeler gauge. The distance between the halves of the LockRight, that is between the two drivers, should be about 5/32-inch (.156-inch, or 3.86-mm). The tolerance limits are between .145-inch (3,68 mm) and .170 inch (4.32-mm). If this distance is much over .170-inch, either the case is quite worn or the thrust washers are missing or are too thin and problems should be corrected before proceeding further.
even when you baby it along, the unit will lock up. and not slip on its self going in a straight line.unless your rear tires dont match in height and have a auto, then I could maybe see that.