Automobile transmission shaft bracket and automobile universal joint is a combination, then how did they mutual cooperation, to jointly promote the?

Universal joint refers to the use of ball device of shaft power output to achieve different directions, a very important component of it is also on the car. Universal joints and drive shaft combination, called the universal joint transmission device. In the front engine rear drive vehicles, universal joint drive device is installed in the transmission output shaft and the driving axle main reducer input shaft; and the front engine front drive vehicle omits the transmission shaft, universal joint is installed between the both are responsible for driving and be responsible for steering front axle half shaft and the wheel.