I have several Schumacher gear riffs and never had this issue. Can you check and confirm a couple of things though? It sounds as if both halves of the diff casing aren't touching together. Is the mesh of the gears inside the diff at all tight? Can you also check you are using the correct holes for the three screws that hold both halves together? It is possible to be using the wrong holes which will cause the screws to be not central.
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