It could possibly be a faulty u joint on your driveshaft. I had this same issue you are describing and after diagnosis the u joint was loose and had play in it. I just purchased a brand new driveshaft and installed it and the clunk noise went away permanently. In my experience I have seen this being differential or suspension related as well. The clunk noise will just get worse over time. If you can’t diagnose this noise yourself take your Z to a reputable shop or a Nissan dealership service department you trust and have them diagnose it for you good luck.
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