If you are leaking fluid from the passenger side it can only be a bad axle seal which is located just to the outside of the CAD. That plastic piece on the outside does not hold in fluid. If you decide the 1 piece shaft is for you, now would be a good time to do it. It's more work to do the 1 piece axle swap than to just replace the outside passenger seal but you will be a good part of the way there to just replace the seal.
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4.0, AT, 3.5 Fabtech, 1" SRS, 1" BL, 35x13.50x15 Toyo MT's, HP30, TJ shafts, Lockrite, 8.8, Power Trax No Slip, 4.11's, Warn bumpers, W8274, SYE, and a bunch of other stuff....