I email Powertrax two or three times a year asking for a release date on the No-Slip. This past time I recieved an email that Powertrax was purchased by Richmond Gear and that any projects that were in the works would be bumped about a year.

On a different note, the latest issue of 4Wheel&Offroad mentions a locker called Offrotec http://www.tibus-offroad.com/html/lockers.html. I did a quick search and found that they have an Xterra Application (at least their web site said they did). I'll do some more checking if it's actually for the H233B 33-spline.