my car CONSISTANTLY grinds going into reverse. ive had problems with my tranny while under warrenty, like the reverse, 1st, and 3rd gear synchronizers going out. so the other day, i started the car, then revved the engine a little just to hear my exhaust. so i put the car into reverse too quick, when the rpms were still~1500-2000 rpms. there was a LOUD grinding, and my speedo needle jumped to its max position and went back down. i guess its called "pegging". is this bad?? do you think i hurt anything?