I don't think there are any clips. The axles almost touch each other in the center of differential with just a washer between them. Did you pull both axles and inspect the splines and check for a broken axle? Spines in the axle caps ok? Can you hear or feel the ring gear spinning. Maybe remove the oil level plug on the front of the case and look at the ring gear to see if it spins. If the ring gear is spinning with it running and forward or reverse selected, and the axles and caps look ok then the spider must be broken. Remove mast assemble and then the differential case. The ring gear and spiders can be accessed then.