Today it seams i have a major issue with my transmision. upon going to lunch my car had a hard shift from park to reverse. didnt think nothing of it, proceeded to head home and when i was leaving my house the car suddenly had no gears. car would rev not entirely freely but would rev with no movement. checked fluid level was a lil low not much but i added a lil with no change. tried all gears not a single one would move the vehicle. but if i rev it up a lil suddenly it would engage and jerk just momentarely but not stay? any ideas what could have gone out or possibly broke? trans was working fine til that hard shift from park to reverse!