I had my transmission replaced twice on my 09 Z under warranty. The first one started to have grinding between 5th and 6th and the second one grinder between 4th and 5th. Even the third one which was the last one I got started to grind again between 4th and 5th by the time I sold it at 74k miles. My thoughts are if it's out of warranty its not worth it to replace. Its just the synchros reacting slower in the high gears idk why it happens. But if you shift slowly and gently enough into those high gears it doesn't grind at all. Or hardly at all. And how many time would you power shift into 5th or 6th? That's like 120ish mph and 145ish mph.. you're rarely at those speeds. So my thoughts are to just leave it alone. It's not that big of a deal.
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Blue Z34-->Red Z34
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