Advance HCT1100 Marine Gearbox The Advance 1100-1200 series marine gearbox has the functions of reverse, forward, clutch, deceleration, and withstand propeller thrust. The HC1200/ HC1200/1 gearbox is a vertical off-center one-stage transmission structure, the HCT1100/ HCT1200/ HCT1200/1/ HCT1280/2 gearbox is a vertical off-center two-stage transmission structure, and the HCW1100 gearbox …