It might be Quaife's fault if by bolting it to the ring gear it causing a small amount of runout. I've read one thread on the 350z forum where this was the case.
On my car, the installer said no shims for the backlash were needed, even though he ordered them all just in case. So either he got the backlash wrong, which is the most likely, or there is other possible factors, like the runout.
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