I took a video of the sound. It only happens when I ride my clutch a little bit, like going up a driveway, but its after i hit the gas and the RPMs are settling down (if that makes sense). So there is no rattle when the RPMs are increasing, only when decreasing or or pushing in the clutch to go back to neutral. It happens in 1st, 2nd and reverse, but when im going slow. I listened really hard and couldnt hear it in any other gear or when I accelerated at a normal speed (like accelerating from a stop sign or light)
as for the video, you can hear the sound the best in the last couple seconds of the video.