I replied on the causes of transmission rattle on the other forum in extensive detail when answering Zoltan's great question. If you want to understand the root cause of the noise, you can go there and read my answer. For the short version, basically it just annoying and it doesn't hurt anything or mean that your car is going to blow up or anything. I think every car I have ever driven with an aluminum transmission case makes this noise to some extent or other when warm. On some cars its barely audible but the Z is on the more noisier side of the scale.
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