I too am looking at a ZJ rear axle sitting on my bench as we speek (or type). I appreciate the info given tjhawk and Lead but it dose seem to have taken a step away from the topic. Just my two cents. My application may be a bit different being My rig is a 99. Is it true the 99 model has the WJ master in it already? What prop valve is needed to do conversion correctly? Can I eliminate the parking brake shoes and hardware(No parking brake currently and did not plan on replacing it)? Just a couple questions before I get started.