Whenever I get to about 1500 rpms I hear a slight rattle coming from the shifter base or somewhere around there. And it just gets louder from there. I have a stock t5 and a UPR short shifter. It goes away whenever I let off of the gas or push in the clutch. It almost sounds like a loose bolt. I haven't had time to look yet but when I do I would like some ideas of what to be looking for. Thanks.