My daughters 98 E320 transmission went out yesterday. She said she had just returned to the car in the grocery store parking lot and started the car, without ever putting it in gear she heard a load noise and thought someone had ran into her. Having the car towed to my house, upon starting the car there is a loud noise in the park position but if you put in in drive or reverse the noise goes away and it wants to move but I am afraid to drive, as not to tear anything else up. I jacked the car up and put my hand on the tranny pan with the engine running in park and could feel a good vibration. My daughter said there was a vibration while driving it but it went away when she let off of the accelerator. Any thoughts?