The UMI Performance weight jack kit for 1982-1992 GM F-Body is designed to give your classic muscle car a firm ride geared toward auto-x and road race with occasional street use. This race kit is suitable for competition and features 1050lb/in front and 200 lb/in custom wound rear springs. Built from strong US Steel, the jack plates ride on UMI exclusive thrust bearings which spread the load evenly and help with ease of height adjustment. Ride height adjustment works nicely at factory height through 2-1/2" drop. Most track testing was accomplished at 2" drop from stock. Race proven and 100% Made In USA.