The gearbox is an integral piece of the transmission that can, due to normal wear, break down over time. Honda used parts are ideal in this situation. Since a transmission repair, overhaul or replacement can be expensive for the owner, it makes sense to find a used Honda gearbox for its lower overall cost and quality. Honda used parts are inspected by trained, qualified mechanics who understand the specific requirements for every Honda part. A repair or rebuild that calls for a gearbox would best be served by a certified used Honda gearbox.