1.By referring to the design idea of Japanese Toyota, this product adopts shift positioning system design of three positioning grooves, to improve the shift positioning accuracy, reduce the shifting system jitters and wear of shift fork / gear sleeve. A positioning seat is added for the gear, to enhance the shifting feeling and increase the inhalation sense.
2.Maintain the main structural features of the existing 474 shell, and reduce the risks from re-design; 
3.Implement manufacturability transformation of the shift system combined with the domestic technical conditions under the premise of quality assurance. 
4.Carry out three-dimensional correction of teeth, to reduce the impact caused by gear transmission error generating from heavy loads.
5.Increase the bearing torque; design transmission gears with the car design concepts and reduce noise.