The UJ Cross, or universal joint cross, is a small but essential driveline component that connects the propeller shaft to the gearbox and differential. Its cross-shaped design allows two rotating shafts to transmit torque smoothly even when they meet at an angle, keeping power flowing to the wheels as the suspension moves over uneven ground. It is a critical part in light, medium, and heavy commercial vehicles alike, where consistent power transfer under constantly changing angles is essential for reliable operation.