A used transmission is a pre-owned component of a vehicle's drivetrain that has been removed from another vehicle and is sold for reuse. It includes all the gears, shafts, and related parts necessary for transmitting power from the engine to the wheels. Used transmissions are often sought after as a cost-effective alternative to new or rebuilt units, particularly for older vehicles or for those looking to minimize repair expenses. These components undergo varying degrees of inspection and refurbishment before being sold, and their reliability can depend significantly on their history and the quality of any reconditioning they have received. Buyers typically seek out used transmissions for their affordability and availability, especially for discontinued or hard-to-find models.