Im new to the whole T5 scene and the sn95 scene as well. I always built my foxbody mustangs to have a built c4 or built aod so im sure i screwed up this t5 because i cant drive a stick for shit. Im getting a rattling/knocking noise coming from the trans (i think) when im at about 40mph. I believe its from my lack of down shifting. What do you think would cause this?