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Is it one of the two front bolts that breaks or the single rear bolt?
I recall reading of people with 80A purple diff bushings complaining about whine. Driving style can play a roll. The rpm at which whine occurs is in a limited rpm range, which of course varies by gear. You will likely only notice it in the upper gears when traveling at a steady speed in the particular rpm range. Some people may drive in such a way that that they tend to avoid the rpm range or pass through it quickly. That is not the case for me. I notice it in 6th of my 6MT when cruising on the highway probably in the 55-70 mph range. I changed my bushings years ago and don’t really pay attention to the whine anymore, but if I did, I could pick a narrower speed range at which I hear it most; my recollection of 55-70 covers onset speed through tapering off speed.
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