i have a an 86 4runner that was running great until a last month. the tranny now makes very loud noises when i dont have my foot on the throttle, go to slow down, shift. it has a rattling sound. also when im on the freeway when i go to shift into 5th gear it rattles and is really quite violent. and when im the freeway andlet off the gas the whole dam truck shakes, especially the tranny. im curious if anyone has an idea of what it is, or any help at all would be appreciated.