Genuine Spicer heavy duty u-Joints are engineered to ensure peak performance in the truck that you count on for your livelihood. Why trust your commercial vehicle to any less than genuine Spicer truck u-Joints? In these heavy duty universal Joints, Journal crosses are cold-formed from high-quality steel that is heat treated for maximum strength. The bearing cups are extruded, carburized and case hardened to a uniform depth for strength and durability. All attachment points are precision formed to insure precise lock-up tolerances and yoke ear fit. Not only are Spicer U-Joints stronger than other aftermarket auto parts manufacturers--they are consistently stronger. Spicer 10 Series U-Joints outperform all others in competitive testing - particularly when it comes to strength. You'll get longer, stronger and more reliable performance in real-life conditions.