One other hint - use some locktite when tightening nut on the bottom pulley. I've seen a few of these loosen up already and cut the belt cover. I don't believe the transmission would cause the noise, but who knows - we're on new ground with these just like when the 1st direct drives came out in 1984. It will take a few years to learn all of these machines quirks and idiosyncracy's. These, my friends, are the new direct drives whether we like them or not. We're just unfamiliar with them right now.