Also, what I basically forgot to mention in OP, is why does this sound only occur in 3rd 4th and 5th, and why can I control it for first and second. As long as there's torque or accel from the engine in 1st and 2nd, the sound won't occur, but if I launch to where it doesn't make the sound, then bring it to 4,000 rpms, as soon as I reach 4k, the sound will start because I'm not continuing the acceleration.

It's all very strange to me.