Often during the course of trying to solve 1 problem you create others. I have more than a couple of the T-18's have similar problems. One thing to look at is sometimes while trying to loosen or free up the shifter it can get "out of place". There are 3 shift rods and the bottom of the stick rides in the center, however it can get outside of the area that it is intended to be in. Solution; remove the stick check for the alignment of the shift rods, alter or move them if necessary(with a large flat head screwdriver) and then reinstall the stick.