Complete overhaul including parts: includes changing clutches, gears, repair kit, and gearbox gaskets with original or approved commercial spare parts as you wish. Providing imported and refurbished gearboxes: In case the current gearbox is completely damaged and cannot be repaired, an imported and guaranteed gearbox will be provided. Extended warranty: Most ads offer a documented warranty on gearbox overhaul, usually ranging from 6 months.