Sounds like it's not tight enough. If you set the diff tension as per the manual, I would suspect it has come undone, as it shouldn't slip. The key to setting the tension is to tighten the diff screw (once the tension is as desired) and the setting screw (in the opposite outdrive) against one another at the same time. There's no way it'll come undone if it was tightened in this way.
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