Hey everyone, I've been struggling to figure out what exactly is wrong with my car. Around 4800-5000 rpm the shifter rattles really loudly, it almost sounds like a marble is rattling around in it and it vibrates really bad. So far I've installed an aluminum driveshaft, engine and transmission mounts, changed the transmission fluid and tightened up the shifter bolts. I also just got a new clutch recently. Has anyone else out there had this problem or have any input? I'm getting really frustrated with this haha. Thanks!