Gears Repair / Rerate We have experience repairing and rerating all brands of gearboxes (Elliott, Falk, Lufkin, Marley, Philadelphia Gear, Terry, Western and others) and all types of gears (worm gears, helical, bevel, spur, herring bone, sprocket, double helical, rack, internal and spline). Reconditioned / Drop in Replacement Reconditioned gearboxes are available. This could allow you to obtain a duplicate gearbox without taking the existing unit out of service. In some situations a new drop in replacement gearbox can be manufactured. Gear Sets Spare gear sets can be manufactured for most brands.