worm gearbox 40/70, 50/80, 60/100, 70/120, 80/135, 100/155, 120/175 and 135/200 Center Distances RATIO:200 ... /80, 60/100, 70/120, 80/135, 100/155, 120/175 and 135/200 Center Distances 200 through 1800:1 Single ... Frequent Starting Stable Transmission with Reduced Vibration and Noise. worm gearbox