8.75 Diff Questions 2nd try

The axels and bearings are brand new. The green bearings have o rings on them to seal them to the housing and snap rings to set the depth into the housing. There is no adjustment on the axels that I can tell. they just slip in (With help from a block of wood and hammer) and then the retainers bolt on. The case is full to spill on the fill port. The diff was not touched from when it was removed from the doner car. It did not have any noticable wear on the ring teeth, but I am not sure what to look for. There seems to be a clunk sound when I let the clucth out sometimes like there is slop in the dif between the input and output. Anyone rebuild these? What special tools do I need?