GM 4L60E Raybestos ZPAK Transmission Rebuild Master Kit 1997-2003 This transmission rebuild kit includes Raybestos Friction and Steel Clutches with 3-4 ZPAK, Sealing Rings, Metal Clad Seals, Gaskets, Orings, Rubber Piston Seals and Bonded Rubber pistons for 3-4; Forward; and Overrun. This 3-4 ZPAK additional clutches to increase friction plate capacity. This allows for an increased torque load with reduced heat generated. All these Kits have Gasket Sets made by Precision.