Yes, your axle should be a reverse rotation axle. "Reverse rotation" simply refers to where the pinion meets the ring gear, and is not exclusive to front axles only. Dynatrac and Currie both make "reverse rotation" front and rear axles, which are more commonly known as "high pinion" or "high center" axles. In a RR axle the pinion mates with the top of the ring gear vs. the bottom (coincidentally, a location where the force is being applied to a larger, meatier portion of the ring gear).
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NISSAN IFS SUCKS