GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 General Information 🢒 General Information 🢒 Fluid Replacement

Removal Procedure
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    2. Object Number: 102870 Size: SH
  2. Remove the oil fill plug.
  3. Catch the oil in a suitable container.

    4. Object Number: 102872 Size: SH
  4. Remove the oil drain plug.

Installation Procedure

    Object Number: 102872 Size: SH
  1. Remove all of the existing sealant from the oil drain plug.
  2. Apply a thin bead of sealant GM P/N 12346004 to the threads of the oil drain plug.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the oil drain plug.

    4. Tighten
    Tighten the oil drain plug to 37 N·m (27 lb ft).

  4. Fill new transmission oil to the level of the fill plug hole. Refer to Lubrication Specifications .

    5. Object Number: 102870 Size: SH
  5. Remove all of the existing sealant from the oil drain plug.
  6. Apply a thin bead of sealant GM P/N 12346004 to the threads of the oil drain plug.
  7. Install the oil fill plug.

    8. Tighten
    Tighten the fill plug to 37 N·m (27 lb ft).

  8. Lower the vehicle.