Actually 35k is about when something like that would go out. Most likely it was a machining or defect in the metal that led to the early failure. This is a good thing and why cars come with warranties. I wouldn't worry about it unless you start breaking syncros every 35k, then it might be your driving style.
Also I went from a 4 banger '98 S-10 to the Z, I enjoy spirited shifting as well 
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2013 Nissan 370z Magma Red Base w/Sport package 6speed. AAM intakes (S-line for now, still needs tuned), Berk HFC's, ARK DT-S cat-back, CJM baffled oil pan, and FI 34 row oil cooler.
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