Sierra 1500 2WD V6-4.3L (2008)
Automatic Transmission Dipstick - Dipstick Tube: Service and Repair
Allison - Automatic Transmission
Transmission Fluid Filler Tube and Seal Replacement
Removal Procedure
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 (See: Service and Repair/Removal and 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 (See: Service and Repair/Removal and 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. Remove the fill tube plug (1).
11. Remove the fill tube plug seal (2).
Installation Procedure
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.
