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The 44A is the strongest axle that was used in the ZJ and if rebuilt right will last a whole lot longer than 20-30k miles. My guess is whatever idiot replaced the bearings last time didnt know what he was doing. The 44A is still used today in the SRT8 grand cherokee. It's a lot stronger than people give it credit for.
BTW your front axle is a D30 not a D35