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Does anyone worry that replacing the tranny will decrease the value of z if you intend on keeping your car for the long hall? I hear car collectors constantly referring to "original engine and transmission."
Which car do you have that a collector will care about? Unless you own one of the first 10 350z, or you own a low-numbered Nismo, your car is not collectible.
That doesn't mean that you have to shift slowly, but it may slow you down in the beginning. If you jam it in, your gonna grind - at least in my ride when you are + 3.5K rpm.
Let's go back to why they fail again. The rings on the synchros become loose. That has nothing to do with driver error (see baulk ring above).
There was absolutely nothing I could do in my shifting to prevent the grinds from happening. They happened no matter how slowly, precisely, etc. you tried. The CD009 generally fixed it - so if it was driver error, how did the CD009 magically cure my shifting? It didn't, the trannies are flawed.