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Probably overkill unless you like drag racing. There are a few reports of broken diff bolts, somersaulting in diff cover and/or subframe damage, but not many such reports. If the theory is that the bolt fatigued or gets tweaked and then fatigues and breaks, find out which bolt is most likely to break and just replace it or replace all 3 bolts but leave the bushings in place. That would be easier but I remember that rear bolt being tucked up high—it may not come out unless you lower the subframe at least a bit (maybe just loosening the subframe bolts would be enough but I don’t know for sure).
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