Removal ProcedureRaise and support the vehicle. Refer toLifting and Jacking the Vehicle.

Remove the fill plug-(1).Installation Procedure

Clean the fill plug and apply adhesive GM-P/N-12345493 (Canadian-P/N-10953488) tothe threads.
Caution:Refer toFastener Caution.
Install the fill plug-(1) and tighten to 39-Y (29-lb-ft).Lower the vehicle.
Drain Plug Replacement Automatic Transmission Unit
Transmission Fluid Drain and Fill Automatic Transmission UnitPiston and Connecting Rod Disassemble Engine Block Cylinder Block Piston Assembly
Special ToolsEN-46745Piston Pin Retainer Remover andInstallerFor equivalent regional tools, refer toSpecial Tools.Warning:Handle the piston carefully. Worn piston rings are sharp andmay cause bodily injury.Disassemble the piston rings-(1, 2, 3, 4, 5). Usea suitable tool to expand the rings. The pist ...