i was out driving tonite and i was curious to my 89 coupe's (auto) top speed is. so i took it to 130mph approx 5500rpm, and decieded that was it for one night, so while at 130mph i put it in neutral (N) to coast back to a slower speed. when i got back down to about 75-80mph i put it back in drive (D). right when i did that, i heard a very quiet scratching or chattering noise come from the engine bay that only lasted about a second. so i ran the car to about 100mph and then went into neutral again to coast back. when i got to 75mph or so i put it back in (D) and it still did it. i dont think anything got damaged cause everything ran fine on the way home and in the parking lot. it wasnt loud and scary but i heard it and im just curious to what it might be. im guessing something just engaging back into gear while the wheels are already spinning. i used to have a 87 coupe (manual) and i would throw it into gear while moving but never got that noise before. any suggestions??? thanks