So the diff stock has 3 mounting points, and all have bushings. Let's assume they get a bit loose and they all have some play. You now introduce a diff brace which is most often - completely solid, it has no bushing whatsoever. What will happen is - you will eliminate a lot of play...but you will additionally introduce a whole lot of stress on the brace mounting point. If you have the version that's mounted using just two cover bolts - I can imagine that being a potential problem. If you have the version where you have an additional screw on the diff cover - that might be better, provided that the mentioned screw doesn't go to ****.
I think that altogether - it's a bad solution and you should change bushings.
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