Sierra 1500 4WD V8-5.3L VIN Z Flex Fuel (2005)
1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating temperature of 82-93°C (180-200°F).
2. Park the vehicle on a level surface.
3. With your foot on the brake, move the shift lever through each gear range. Pause for about three seconds in each range, ending in Park.
4. Apply the parking brake and let the engine idle for 3 minutes.
5. Remove the transmission fluid level indicator. Wipe the indicator clean. Insert the indicator. Give the indicator a full twist in order to close.
6. Wait 3 seconds and remove the indicator.
7. Read both sides of the indicator. The fluid must be within the hot cross-hatched area using the lowest level reading.
Automatic Transmission Fluid/Filter Replacement
Automatic Transmission Fluid/Filter Replacement
Removal Procedure
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan drain plug, if equipped.
4. Allow the transmission fluid to drain completely.
5. Apply a small amount of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the treads of the drain plug, if equipped.
Notice: Refer to Fastener Notice in Service Precautions.
6. Install the oil pan drain plug.
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Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.).
7. Remove the drain pan from under the transmission oil pan.
8. Support the transmission with a transmission jack.
9. Remove the transmission mount nuts.
