Product Details: Ensuring you are Ready for the Road Ahead™, the Spicer SPL100 Series Greaseable Universal Joint lends to 30% increased bearing life compared to leading competitors. The universal joint permits driveshafts to move up and down with the suspension while the shaft is moving. With precise heat treatment, hardened case, and enduring processes of journal grinding, this heavy duty replacement u-joint make sure power can be transmitted when the driveshaft is not in a straight line between the semi truck’s transmission and drive wheels. Gain increased life and decreased maintenance time and costs with this Spicer universal joint.