From this response, I don't think you do understand what I was getting at. One of your two cables casings is no longer anchored to the transmission housing. If both were, you would not have a problem. What would be best for you is to have another person helping you. Make sure both shift levers on the transmission are in neutral. Have one person try shifting between 3rd & 4th gears. You will see one cable moving the shift lever. If this one works, you will be able to shift gears between 3 & 4. Then have that person try shifting between 1st & 2nd gears. If this doesn't work, look at how the cable casing moves instead of the cable itself and the shift lever. That is because the cable casing is not anchored. It could be the other way around regarding which gear shifts cause the problem, but it will be readily apparent. Given one of the cable casings is anchored and the other is not, look carefully at both anchor points and try to see what is different between the two. I think you will be able to find the cause. That will give you a much better idea of how significant the problem is.