The synchros in the OEM manual trans are crap. They are known for grinding in to gear when power shifting. Only 6th gear grinds on my Z (for now). I can power through 1st through 5th with no issues, but if I want to avoid grinding in to 6th, I need to push the clutch all the way down, wait a second and then shift in to 6th. I took it to a reputable place in Maryland a few years ago and they recommended replacing the trans with a new one. That seems to be the general consensus with this issue. Or at least it was back then.
As far as shifters go, I installed a B&M short throw about 10 years ago and haven't looked back. It works well, was easy to install and I've never had any issues with it.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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