I was under the impression that the "8.4" axle housing and the "8.0" axle housing were significantly different. From the previous posts in this thread, it seems that is not the case?
I don't mean to hijack.
This seems like a great deal of work for an E-locker.
I personally think that the 8.4" diff is a little stronger than the E-locker diff, due to the girdled carrier bearings.
Why not get an ARB air locker?