I had the rear carrier (the e-locker) replaced with a True Trac on my 05 crew in February 2009 as pro-active maintenance task before it failed.
You can forget all this stuff about the axles. The axles are different lengths, there is no way they can change sides, they come out and go back in, period.
Things to consider, if you have a fair amount of miles on it and since the rear axle seals have a tendency to leak, you may want to replace them. To replace the seals you need to remove the bearings and the bearing retainer sleeve. The sleeves need to be cut off, not a shade tree project. So while you are this far why not replace the rear bearings.
Axle oil seals Nissan Part # 43252-7S200, $45.00 each from the dealer, they may found at local parts shop by now???
Bearings: from NAPA, # BR10, $45.00 each.
I had mine replaced at Performance Drive Line in Danielsville PA, the True Track installation cost was $300.00, I already purchased the TT.
I let the connector attached to the differential because without it you will have a hole in the rear center section and you can’t do that! There were no warning/error lights at all with the E-Locker removed.
Regards
Note: the bearing #'s I listed are for the carrier, not the axle. I did not replace my axle bearing as they were fine.