DR are the problems with just the Nissan versions, haven't stayed on top of the Jeep stuff lately.

I know Jeep now offers the JK Rubicon axles complete with discs, lockers and steering for $1400 from the dealer, front or rear.
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FSRBIKER
97 TJ, 2" lift, 32's
69 Bronco, locked Dana 44, 35" MTR's, 5.5" lift
EOE...Opening Soon!