It is hard to diagnose a noise over this site and it would be best if a reputable shop or even your local Nissan dealership service department perform this work. From how you described this issue with your Z. Depending on where this metal grinding noise is coming from on your Z? It is possible one or both of your wheel bearings is going bad. Wheel bearing failure is a common problem on our Z’s. Also you could have a bearing in your rear end that is going south it can happen at any mileage. Something can be rubbing against your brake rotors as they turn when you are driving. Do you keep up with all your general maintenance on your Z? Have you ever changed your differential fluid? Without hearing this noise in person it will be hard to diagnose here. Give us more details about your Z.
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