GM 4L60E Transmission Power Pack Master Rebuild Kit 1997-03 This kit has all of your Alto Friction Plates, 3-4 PowerPack, Steel Plates, Sealing Rings, Metal Clad Seals, Gaskets, Orings & Bonded Piston The Alto PowerPack is for the 3-4 it has additional clutches to increase friction plate capacity, which increased the clutch apply area. This allows for an increased torque load with reduced heat generation.