Advance HCD1400 Marine Gearbox The Advance 1400 series marine gearbox has the functions of reverse, forward, clutch, deceleration, and withstand propeller thrust. The HCD1400 gearbox has a vertical off-center primary transmission structure, and the HCT1400/HCT1400/2 gearbox has a vertical off-center secondary transmission structure. This series of gearboxes have the characteristics …