This assembly is a must for all heavy duty C6 applications. The included OEM 4R110W four pinion aluminum planetary carrier offers 33% more torque capacity over the OEM C6 three pinion type. All failure prone thrust washers are replaced with high capacity thrust bearing assemblies for increased durability and friction free operation. Kit includes stress relieved front ring gear and front ring gear flange, a rollerized front planetary carrier, sun gear with heat treated shell, front and rear carrier bearings, and bronze front ring gear thrust washer.