My 915 box rattles/tinkles when in gear and driving. if I move the gear lever off where the return spring has it sitting it doesn’t rattle. sometimes it does it more than other times... it certainly doesnt sound normal, but I dont have any issues otherwise. Grinds a few times into gear if I dont take my time. Im thinking of switching over to a GL5 80 90 from a mobil 1 75 90 synthetic. My throwout bearing sucks too, it also rattles when the car is in neutral... need to take that out. I have the lightweight flywheel. Thoughts?