I would put blue threadlocker on the nut, if it wasn't done before. My rear most wet bolt on the streetside broke in half last late october. Now have a grade 8 bolt and two nuts on in order to make it to morryde at the end of may. And I always greased twice a year, so crap just happens sometimes. Putting my hopes with the 8k i.s. system.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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