Help please folks, I think my gearbox (auto in 300te) is up the spout. The symptoms are as follows...... Everything OK up to 30mph. Then, a noise from under the car, gearbox area like a playing card rubbing against the spokes of a pushbike (yes, agreed, sounds stupid, but I did it as a kid with my raleigh chopper to make it sound like an engine....ahem......go on admit it) The faster the car goes, faster the noise. Drop to 29 mph, noise dies down, then goes away. The car shifts gears although I havn't pushed it over 30. I would really appreciate the help. Could it be that something has fallen off inside?