GM 4L80E 4 Speed Overdrive Deluxe Overhaul Rebuild Kit for Years 1997-Up This Super High Quality Kit is made by TRANSPARTS This rebuild kit includes all the Friction Plates made by ALTO, Sealing Rings, Metal Clad Seals, Gaskets, O-rings, Rubber Piston Seals, Overrun Piston, Forward Inner Piston and Direct Piston (Pistons are not pictured).