What vehicle component has U joints at each end?

The drive shaft is a critical component in a vehicle's powertrain, connecting the transmission to the differential and allowing power to be transferred from the engine to the wheels. The universal joints, or U joints, are essential in this assembly as they enable the drive shaft to pivot and accommodate the movement of the vehicle's suspension while maintaining a steady connection for torque transfer. This design allows for flexibility and is particularly important when a vehicle is in motion over uneven surfaces, as it can help to prevent stress on the drive shaft and other components.

In contrast, the axle primarily serves to support the weight of the vehicle and facilitate wheel rotation, but it does not typically utilize U joints in the same manner as the drive shaft. The steering column is involved in directing the vehicle but does not include U joints as part of its construction. Similarly, while the transmission is responsible for controlling the power output from the engine, it does not have U joints; instead, it connects to other components via different mechanisms. Therefore, the drive shaft is the only component among the options provided that is characterized by having U joints at each end.