Did you install the locker yourself or have a shop do it? If you don't see anything obviously broken underneath (mainly the rear driveshaft), I would take it right back to whoever installed the locker and get it fixed. To have a failure next day while driving on the street would make me immediately assume that the install was done wrong.
Word to the wise though - don't go back screaming that they messed up your Jeep. Just show up, explain to them what happened and ask that they do you the courtesy of looking into the issue and making a repair (after explaining to you what went wrong).
1992 Cherokee Laredo - mostly stock, DD. 300k miles and counting
2004 Grand Cherokee Laredo - 4.7, bone stock - Wife's DD
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