This AAM Spider Gear Kit is specifically engineered for 1972-1987 GM 8.5-inch standard open differentials with 28 spline configuration. The kit includes precision-manufactured gears and essential components designed to meet original equipment specifications, ensuring optimal performance and durability. Each component is manufactured to exact tolerances for proper fitment and function in your vehicle-specific application. The kit comes complete with spider gears, washers, and shaft, all built to handle the torque and stress demands of your GM drivetrain. Perfect for rebuilding or upgrading your differential, this US-made kit maintains the performance standards established by the vehicle manufacturer. The painted exterior finish provides protection against wear and corrosion. Installation should be performed by qualified automotive technicians familiar with differential rebuilds. This kit comes backed by a 1-year manufacturer warranty, giving you confidence in its quality and reliability.