Quote Originally Posted by luthi
possible valve body issue. if the trans has set up for any amount of time in a dry (with out fluid) condition one of the valves, balls ect could have frozen in place. you can try to disassemble the valve body with the unit in the car, clean it and reassemble. just be VERY careful. if not some of the small balls can become lost. also be sure to replace them in the same spot making sure they move smoothly.

VERY true. specially since the tolerances are extremely tight