1999 Chevy Cavalier dunno whats wrong

Ok the problem started out with an occasional jerk to the left at random times and then one night I took it to the race track and it did fine after this I had taken it to the transmission shop to get it looked at and they said the synchros were goin out in second gear and I have had synchros go out before in another car and the transmission never had complete failure and this car I have now has less miles less wear on the transmission and now it does not even go in to gear it just grinds when u put it into gear and when u ease out on the clutch it makes the most horrible crunch and grind noise what are the possibilites that it is just a spider gear or complete transmission failure.