Warning: This product contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm. EASY TO USE: Disassemble stubborn U-joints by pulling until you hear a “pop” noise; As with any puller, use in conjunction with lubrication if it is not able to force the part free on its own; Remove a stubborn bearing cap with lubrication or heat applied to the yoke; While a new U-joint will break free with an impact tool, frozen parts are best set free by hand tools.