I was always told that when engaging into reverse (manual) I should first press the knob down, then slide the stick to the left, wait a second and then push forward into reverse. Well anyways, I let someone drive my car (mistake) and he put it into reverse without so much as a pause and it looked as if he really pushed the stick hard; sounded that way as well. There was no grinding though. Car is ok. Did he cause damage. Sorry. OCD