More info for loose column shifter

Ok, i posted a couple times before and now i need some more help and info. 1965 valiant slant 6 with three speed coulmn. The issue is that when im in second gear the shifter just falls out of second into neutral. I have to hold it in second (up) for it to stay. I have removed the steering wheel and turn signal switch but now i need a little more direction on what to look for and how to get to it. In ya'lls opinion, is it most likely fixable or repairable or is this something others have had to scrap? Dont have the cash to replace or put in another engine trann etc right now. Ay advice or help would be grealy appreciated. Thnx.