Transmission Trouble

[macx]

Very most likely the synchronizer ring on that
gear is going out. That means removing the trans and taking apart. Not NEARLY as tough or complicated as working on an auto, though, and can be easily done at home by someone who's worked on any manual car trans. Basically unbolt the front snout and rear bearing carrier from the case, take off the shifter cover & shift forks with it, and everything pretty much slides out one end or the other. Swap synchros, and reverse your disassembly procedure.