It seems when I drive my 94 yj for awhile and I feel it's hot, I can't shift. If I'm in neutral then I can't get to first or second or three. If I turn off the engine and turn it on while I'm in neutral I still can't shift to any gears. If I turn it off and put it first I can drive in first and that's it. If I leave it to cool down then I can shift again but not for long. Help!!!