Moog K6390 Idler Arm Problem Solver design includes frame bracket and powdered metal gusher bearing that enables grease to flow through the bearing to the stud for reduced friction and enhanced strength and stability. Greaseable socket design allows new lubricant to flush contaminants from the assembly, reducing corrosion and wear Loose or worn chassis parts can lead to premature tire wear Greaseable socket design allows new lubricant to flush contaminants from the assembly, reducing corrosion and wear Fits 1988 - 1992 GM trucks Easy to install Improves chassis performance and durability Designed as stock replacement