1）Single countershaft, helical gear, large loading capacity, low noise and long life; high fine teeth on high speed gears, smooth meshing.

2) All forward gears are equipped with locking ring type inertia synchronizer, large synchronizing capacity leads to flexible and light shifting.

3) Can adapt to the front engine and rear engine layout requirements.

4) Reasonable configuration of speed ratio and diversity of operation types, can adopt single lever, dual-lever and direct operation, which is convenient for users to select.