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Is this a manual trans. If so does the manual spec a GL4 rated fluid? I find it a real common issue that mechanics will put a GL-5 trans oil in a GL 4 rated unit. The problem is that GL-5 fluid will corrode yellow metals. Often synchronizers are made of yellow metals. It sounds just like what happened to inlaws nissan pickup. Changed fluid and in a few months 2nd gear started to grind even shifted slowly.
I've used redline mt90 (spec'd replacement for 75/90 gear oil) for my nissan, it will improve the shift quality. You can call redline's tech and get them to recommend which of there fluids to use.
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