'84 300sd (diesel, ATF, 215k mi.) sat parked for over a YEAR. Since driving it again (about 6-mos.), the car is running fine, EXCEPT it seems to be losing transmission fluid. Note: NOT when PARKED (no red puddle under the car), only when DRIVING (approx. 1 qt./300 mi.). Any educated guess as to the likely problem and solution? I appreciate your consideration and assistance.