I have a 2004 Polaris sportsman. The rear right axle broke near the differential. I purchased an aftermarket axle and after installation the axle slipped out of the rear diff. I re installed it 5 times and the same thing kept happening. I then purchased a Polaris used axle and it stayed in the first install. Now that axle broke by the diff. I ordered a new HD aftermarket axle and I have the same problem. The axle keeps slipping out of the diff. Do I need to order a new Polaris brand axle? Any suggestions?