maybe I have a m1028 or 1031 front axle (they were alreadyy removed from the truck when I bought them in Albany GA.). When I changed the diff fluid, the carrier had the gears and some clutches in it. From what I can find, the carrier has to be replaced to install a locker. I would like a selectable locker, but they are very pricey. I just need information on what I have in it and what my options are for it. I called Richmond gear and told them that I had a CUCV axle and he didnt seem to have any interest to talk to me.