GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Transmission 🢒 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.
  5. Remove the heat shield. Refer to Transmission Heat Shield Replacement.
  6. Remove the fill tube nuts.
  7. Place a drain pan under the transmission to catch any dripping fluid.
  8. Loosen the fill tube from the transmission.
  9. Remove the fill tube and seal from the vehicle.

    10. Object Number: 2088915 Size: SH
  10. Remove the fill tube plug (1).
  11. Remove the fill tube plug seal (2).

Installation Procedure

    Object Number: 2088915 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 a NEW fill tube seal.

    5. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the fill tube. Ensure that the fill tube bracket is positioned properly on the studs.
  6. Install the fill tube nuts and tighten to 18 N·m (13 lb ft).
  7. Install the heat shield. Refer to Transmission Heat Shield Replacement.
  8. Lower the vehicle.
  9. Fill the transmission to the proper level with approved fluid.