wow dude im sorry but it really sounds like the tranny has went south....and im not sure if thats your exhaust rattling....get under the car and in different areas of the exhaust try to move it back and forth to see if it is it.
If it is your exhaust then id (if it was me) just rig up some wire to hold it in place better. I mean this thing doesnt sound like your taking it to shows to do the hillbilly fix
