I have an 87 LX 5 speed notch that I have had since new. It has 54K original miles, and still has the original clutch, quadrant and T5 with the only change being a Hurst shifter that was added may years ago and I am trying to figure out this issue. It will shift great , no noises etc then suddenly be very difficult/impossible to put into any gear. If I shut the car off then immediatly restart it it will shift fine again. I have driven the car for hours before this happens BUT also driven it for 5 min and had it happen. Any ideas as to what is going on?