Front. Left.4WD. Right.4WD. U-joint. 1 Piece Rear Driveshaft. 2 Piece Rear Driveshaft. A device that connects and allows angular changes between rotating shafts. A flexible double pivoted Joint which allows the inner axle to transmit power to the outer axle at varying angles. Drive Axle Shaft. Inner. U -. Included with: Axle shaft.