50 3100 with 3-sp on the column. It gets stuck in 2nd or 3rd periodically. I can get it home but it's not good for the clutch. I loosen the bolts on the linkage rods, screw around with everything and get it to work great again--for awhile. (I really don't know what particular thing I do to fix it) What's more likely? Do I need a new shift box or do I need to tear into the transmission?