Advance HC2000 Marine Gearbox The Advance 2000 series marine gearbox has the functions of reverse, forward, clutch, deceleration, and withstand propeller thrust. The HC2000/HCD2000 gearbox has a vertical off-center primary transmission structure, and the HCT2000/HCT200/1 gearbox has a vertical off-center secondary transmission structure. This series of gearboxes have the characteristics …