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 UnitSpecial Tools (Diagnostic Tools) Engine Control
IllustrationTool Number/DescriptionCH-34730-2CJ-34730-2CInjector Test LampCH-38641-BJ-38641-BDiesel Fuel Quality TesterCH-39021-301J-39021-301Fuel Injector Harness AdapterCH-39021-460J-39021-460Fuel Injector Test AdapterCH-41415-30GE-41415-30J-41415-30Fuel Tank Cap AdapterCH-42960-2J-42960-2Fuel Fla ...