I am not familiar with the Long Shifter for a Muncie. But if it is similar to a Hurst, it will have adjustable stops of each gear. The shifter may be allowing you to overshift and getting the slider stuck on the hub. After looking inside to make sure everything is OK, I would mount the shifter and check the linkage and stop adjustments. As you know, the 2/3 shift is the most difficult to get perfect in a Muncie or BW. 1/2 sleeve has to go to neutral perfectly and 3/4 has to go from neutral to 3 in one somewhat complex motion.
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