While on my way to my GF's house I opened my Teggy GSR-T while driving up a hill and then engine braked while moving down the hill, usually I don't engine brake. While engine braking I heard what I can only describe as "tumbling rocks."

"Odd," I thought, I checked all my gauges and everything was checking ok. I went ahead and stepped on it and used engine braking again to make sure I wasnt out of my mind. There it was again. I made a spirited row through all the gears to make sure all my gears were still intact, I even checked reverse when I got in the driveway.

Everything seems fine. The engine still runs, I can still shift. Only strange noises if I engine brake

 

throw out bearing?