Backed by superior materials and rigorous testing, MOOG Heavy Duty universal joints deliver reliable performance you can count on. MOOG problem-solving innovations ensure fast, hassle-free installation. Product Features:BUILT TO LAST -- Rugged design specifically engineered for fleets, off-highway and commercial vehiclesSTRONG AND DURABLE -- Bearing cups are cold-formed, case-hardened and precision ground for strength and durabilityKEEPS DIRT OUT -- Abrasion-resistant nitrile seals provide ideal grease retention and protection from under-vehicle contaminantsGREASEABLE DESIGN -- Drilled and tapped grease fitting holes for easy servicing and cross trunnions with large grease reservoirs with radial grease channels for grease distributionINHIBITS PREMATURE WEAR -- Cross trunnions ground to a 15-25 RMS finish for a smooth surface free of microscopic grooves that can cause premature wearRELIABLE PERFORMANCE -- Internal anti-drainback valve integrated into thrust washer controls lubrication flow and prevents dry startupRIGOROUS TESTING -- Comprehensive testing throughout design and development processes by MOOG engineers for quality you can count on