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The 4x4 will not have a rear reluctor ring on the output carrier, be sure if you're using a computer to control it you have one put on while the output is being swapped. And obviously you'll need a sensor for it too.
if they are anything like the 700R4, the 4x4 version tail shaft will be shorter to accomodate the Center Differential, but I could be wrong since its a 4L80E