A word of warning. I previously owned a Jeep that was hopped up with a front locker that used to have the Warn Auto locking hubs on the front. They lasted two weeks before they came apart inside after I installed the locker. Because of this, Phase 4 of my Project X will include manual locking hubs. If you plan on hopping the engine up or putting in a front locker as parts become available, I would recommend using straight manual hubs. Besides, I don't think you are going to find a hub like that for the Nissan.

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Gordon "The Warmonger" White