Rearend slipping on 325 magnummy bike will not move under its own power when I put it in gear I can push it the drive shaft does not move but it makes a clicking type of sound . I jacked it up and turned the wheels while it was in gear it made the sound and looking down on the prop shaft coupling so I could see he grease nipple it did not move. I took the rear axle assembly off and the connections between the coupling and the pinion shaft seemed to be in good shape I then split the rear housing and looked at the gears . At this point I should tell you I don't have a clue what I am doing. So I took some pictures and hope someone can tell me if they are worn out parts

It seems the ring gear is slipping on the axle