GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Transmission Fluid Filler Tube and Seal Replacement

Removal Procedure

    Object Number: 702779 Size: SH
  1. The transmission case has provisions that enable the fill tube to be installed on either the right or left side of the transmission. Proceed to step 9 if servicing the plug and/or seal opposite the fill tube.
  2. If the vehicle is equipped with a diesel engine, the transmission must be removed to service the fill tube and/or seal. Refer to Transmission Replacement .
  3. Remove the transmission fluid level indicator.
  4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the nuts attaching the fill tube to the transmission.
  6. Place a drain pan under the transmission to catch any dripping fluid.
  7. Loosen the fill tube from the transmission.
  8. Remove the fill tube and seal from the vehicle.

    9. Object Number: 658984 Size: SH
  9. Remove the fill tube plug (1).
  10. Remove the fill tube plug seal (2).

Installation Procedure

    Object Number: 658984 Size: SH
  1. Install a new fill tube plug seal (2) into the main housing.
  2. Align the tab on the fill tube plug (1) with the tang on the main housing.
  3. Install the fill tube plug (1). Press the plug into the seal (2) until the tab on the fill tube plug locks into place in the notch on the main housing.

    4. Object Number: 702779 Size: SH
  4. Install the new fill tube seal to the transmission.

    5. Object Number: 702776 Size: SH
  5. Install the fill tube to the transmission. Ensure that the fill tube bracket is positioned properly on the studs.

    6. 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.

  6. Install the fill tube bracket nuts to the studs.

    7. Tighten
    Tighten the fill tube bracket nuts to 18 N·m (13 lb ft).

  7. Lower the vehicle.
  8. Fill the transmission to the proper level with approved fluid.