My Saturn SL-2 with 42,000 miles (I purchased extended warranty from dealer) started shifting hard and at one point jerked so hard I thought I had been hit in rear end. Took it to dealer and of course this is not a consistent problem and they couln't find anything wrong. Very frustrating as vehicle is still doing this (not consistently) It seems to happen more frequently in heavy traffic and stop and go situations. I'm back to the dealer next week and in meantime feel very uncomfortable driving the car. Automatic transmission and seems to be worse from 1st to 2nd, but not good from 2nd to 3rd. Have driven today and shifts smoothly. But tomorrow who knows- please help - I think the dealer thinks I'm imagining this!!