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Transmission is used to change the speed and torque from the engine mechanism,it can be fixed or shift to change the output shaft and input shaft transmission ratio,also known as the gearbox.
Gearbox helical gear has the characteristics of long engagement time, large contact area and smooth transmission, Mainly used in drive axle of heavy truck, for example : DONGFENG DANA AXLE, ZF BYD, DAIMLER And HOWO.China Truck Transmission Gears
website:http://www.china-tractorparts.com/truck-gears/truck-transmission-gears/