My son bought a 98 dodge neon with automatic transmission. While driving to school he got 3 miles (was running great) and all of the sudden he said he heard a noise and wouldn't move. Forward or reverse. Had it towed home, Engine starts and runs fine. Put into drive but doesn't move. Forward or reverse. While engine is running and in drive, when put back into park, you hear a slight grinding noise as if had manual transmission and grinding a gear. While in Park, you can push the car as if was in nuetral. Does it sound like a bad transmission or broken axle? If Axle is it a big deal? Thanks