I have an odd rattle vibration sound that has started. here are the symptoms. Totally silent and non-existent until I hit 45mph @ 45mph it makes the rattle/vibration. It sounds like a heat shield is rattling.... almost like a pebble is vibrating in a tin can. Any speed above 45mph, and I have the rattle. it never gets worse, it stays the same. Clutch in - it rattles Clutch out - it rattles Any and all gears - it rattles Does not change with rpm Bumps dont effect it It sounds like it is coming from the under the center console.... perhaps heat shielding around the tranny???? I took off my leather shift boot... and the sound got alot louder....which makes me think it is coming from around the tranny area. I removed the rubber boot under the leather shift boot... and cant see anything Any ideas?