Because vehicles don't travel on surfaces as flat as a billiard table, driveshafts must be able to move up and down with the suspension while continuing to rotate to ensure uninterrupted power flow to the drive wheels. The universal joints enable this movement while allowing the driveshaft to continue to turn.

The use of U-joints makes up for the height misalignment between the transmission and the rear axle that drives the rear wheels. Since a vehicle's rear axle and rear wheels move independently of the rest of the vehicle, a direct driveshaft from the engine to the axle would bind or flex as the vehicle encounters bumps. The u-joints compensate for that motion, keeping the driveshaft spinning freely. As the driveshaft rotates, the flexible "universal" action of the u-joints automatically compensates for misalignment.

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