This isn't a standard over-the-counter U-joint but was 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 that connect to your driveshaft. Solid-body design - heat-treated forged material construction and eliminated grease fitting reduce structural breakage in body. Pre-greased sealed unit - pre-packed with synthetic lithium grease providing extra friction reduction and temperature resistance. Teflon-coated nitrile rubber outer seals help to reduce seal failure and leakage. Precision-ground and finished bearing surfaces allow u-joint to run true while ensuring accurate fit to yoke.