Product Details: The Spicer 1610 Series Full Round Greaseable Universal Joint ensures you are Ready for the Road Ahead™, lending to 30% increased bearing life compared to leading competitors. This universal joint allows driveshafts to move up and down with the suspension while the shaft is moving. This heavy duty replacement u-joint ensures power can be transmitted when the driveshaft is not in a straight line between the semi truck’s transmission and drive wheels. Experience maximized life and decreased maintenance time/costs of this universal joint, featuring 180° positioned zerks positioned on both sides for consistent lubrication without rotation of driveshaft.