Probably the syncros and probably unrelated to the clutch work unless you are having physical trouble getting into gear.
My 5th gear started doing the same thing around 20K miles. Just be a little patient with it and it won't grind. It hasn't gotten any worse and I'm over 100K miles now. I can still shift into 5th without any noise as long as I take it easy. I don't ever have a need to power shift into 5th on the street anyway.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed |
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