I emailed ARB on a whim yesterday inquiring about an air locker for the d44a in the ZJ and WJ, and got this response:
So it's finally happened! No more having to swap axles around for a proper selectable locker. I've been searching for a Quadra Drive WJ for months without much luck in my price range, while there have been countless QTII and Selec-Trac models. Now I don't have to worry about finding the diamond in the rough or dealing with worn out vari-loks.