I was driving the RS6 earlier today and stepped on it to get on the highway just enough to downshift and I heard noises that seemed like metal grinding/clanking. I stop and try to replicate the revs that I did in gear while the car was parked and heard nothing. At first I thought it could have been just rocks from the road but when I get back on the high way I test it again and this time with the tips and when I downshift to 2 I hear the same racketty noise again. Sounds like metal pieces flying around. Almost like when there is a little bit of sand or rocks in your dryer while you dry your clothes. Is my tranny dying? I dont have much experience with diagnosing trans. PLEASE HELP!