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The first thought in my mind is that you might have a cable problem. What I mean is that the cable that select the different gear positions on the transmission has a spot where the cable has rubbed thru the teflon cover of the cable and getting stuck on the outer casing of the cable. Or I might be wrong and there is something amiss inside the transmission.
To find out one will actually have to disconnect the cable from the lever on the transmission and see when you operate it if there is any resistance.
The cable sits right on top of the transmission and it is easy to disconnect it.
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