well, i always had the hiss even before but the growling did go away and it was only after they replaced the Motor. i maybe have another 500 miles or so on it since i have had it back. i want to let everything settle for a while before I bring it back with the noise again, not having my car for a month sucked. but the low gear does make sense since i only hear it until i hit about 25-30 MPH. the big difference is i only hear the sounds with the windows open, the growling sound i only heard with the windows closed. i thought that was a little strange, but who knows.