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 UnitBalance Shaft Cleaning and Inspection Engine Block Cylinder Block Balance Shaft
Clean the balance shafts-(1) in solvent.Inspect the bearing surfaces on the balance shafts forscoring or unusual wear.Note:Do not remove the balance shaft drive sprockets.Inspect the balance shaft drive sprockets for wear, damage,or missing teeth.Measure the rear bearing journals on the balance shaf ...