I have a '46 CJ2A that i drive occasionally. the other day i went to drive it and it will not shift into gear. Meaning that the gears grind. If i turn it off, put it in gear and try to start (clutch pushed in), it will try to move. Like the clutch is not engaging / disengaging? I have not even tried to troubleshoot. shat could be the problem? Gear oil low/empty? clutch stuck? Would pulling it in gear possibly free it up? just asking before i start tearing into stuff.