BJ, all apear to be straight and lined up, upon further inspection there were a few small feather pieces of plastic on the pinion gear that I removed, applied some teflon powder ran it again with the Grumpner 9x5 prop (Speed 400) seems to run smoother, but alot of vibration! Gearboxes are new to me, do they all vibrate this much? This is going in my HL Super Cub, wich is a fragile airframe to begin with....any thoughts, ideas would be much appreciated! Thanks, Eric