This won't exactly answer your ? SEXterra but for what it's worth...This is what the ProwerTrax wesite says about the No-Slip Traction System:

Powertrax No-Slip Traction System as can open differentials. When upgrading a limited-slip/posi differential, it is only necessary to remove preload springs before removing the spider gears, and to remove the friction plates after removing the side gears. For centrifugally activated differential upgrades, it is necessary to remove the governor counter weight and tumbler assembly before removing the spider gears (GM Gov-Lock). Powertrax provides a special tool with each centrifugally activated differential model that easily facilitates this step.

They (PowerTrax) don't say anything as to the LockRight and an existing LSD. Of course, if you look at their application data pages you will see that Nissan is not listed. Yet? Did Calmini jump the gun? I know the Detriot is available for the H233B from their website.

Todd, I'm with Ian, why won't any of these work with the Xterra? Is the H233B different between the X and the Pathy? Please clarify. I want one of these so am curious also. I hate my open diff.