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Of course installing more rigid/less compliant bushings can increase NVH by not dampening vibrations/noise, that's given. Though i'd rather expect to hear some whine from gearbox mount/bushing change, not diff's, but it's after shaft next in transmission, possible. (also my guess is that whine is also in other gears, just that drowns in road/tire noise in faster speeds/lesser rpms, so you don't hear it).
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