today i go to a stop and i take off normally out of nowhere i hear grinding and rubbing and my car just revs up and my speed drops. then my car wouldnt pop into gears good or it would drive good for a little then it would just go back to reving up and going nowhere or it would be in drive or any other gear and jsut not move anywhere. you can also hear a grinding noise from underneath the car. im guessing my trans is gone the clutches might be gone. do you guys got any other ideas what this might be?? thanks