Hyundai D4DD gearboxThe Hyundai D4DD gearbox is a robust 5 speed manual transmission engineered for commercial heavy duty applications. This mechanical gearbox pairs seamlessly with the 3. 9L common rail diesel engine, delivering reliable power transfer in demanding conditions. Built for high torque performance, the 4x2 drivetrain configuration ensures durability and consistent operation across long haul and intensive work cycles. Ideal for commercial vehicles requiring