i parked my 93 f150 for about 3 months and when i started it back up i didnt have reverse never sliped just wasnt there so i droped the pan and changed the filter and fluid but i found a lil plastic plunger in the pan its about 2 1/2 inches long skinny one one end and rounded on the other with a hole in the big end and a o-ring in a grove around the big end i was thinking thats the problem but i have no clue where it goes so any help would be great thanx