This isn't your normal over-the-counter U-joint! Specifically designed for today's demands in drag racing, off-road, and performance applications. Currently, applications are available to fit the three most commonly used yokes. Features solid-body design - Heat-treated, forged material construction and eliminated grease fitting to reduce structural breakage in body. Pre-greased sealed unit -Pre-packed for life with synthetic Lithium grease, providing extra friction reduction and temperature resistance. PTFE coated, nitrile rubber outer seals - Reduces seal failure and leakage unlike standard designs. Bearing surfaces precision ground and finished - Allows joint to run true and to ensure accurate fit to yoke.