I finally got my car on the road again, its an 87 gt with a full mac exhaust system, 3.73 gears and an a/c delete kit....when i was driving it i noticed that when im in 3rd gear or up, i seem to hear a rattling sound that appears to come from the tranny....my question is what the hell could it be! there is minor vibration, but it is quite loud. any ideas?