I let a friend drive the car today and while on the highway she wanted to downshift into 4th, but instead jammed it into reverse for a couple seconds (making the most awful grinding noise I have EVER heard). When we got to our destination I noticed that once engaging reverse, it was VERY difficult to get back into neutral. I also noticed a new faint tapping sound when cruising in gear at lower RPM (in addition to the "angry bees" shifter noise I've always had). Any ideas on what this means, if anything? I have aftermarket clutch, shifter, etc. but the tranny itself is stock and has been wonderful thus far. Thanks.