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Hot Fluid Check

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: The fluid must be hot to ensure an accurate check. The fluid level rises as temperature increases.
  1. Operate the transmission in D, DRIVE, range until normal operating temperature is reached. Normal operating temperature is any of the following:
    • Sump temperature 71-93°C (160-200°F)
    • Converter-out temperature 82-104°C (180-220°F)
    • If a transmission temperature gage is not present, check the fluid level when the engine water temperature gage has stabilized and the transmission has been operated under load for at least one hour.
  2. Bring the vehicle to a complete stop on a level surface using the service brake.
  3. Ensure that the engine is at low idle RPM, 500-800 RPM.
  4. With the service brakes applied, place the transmission in the P, PARK, position.
  5. Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
  6. Apply the parking brake and ensure it is properly engaged.
  7. With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.
    8. IMPORTANT: Always check the fluid level at least twice using the procedure described above. Consistent readings are important to maintaining proper fluid level. If inconsistent readings persist, inspect the transmission vent assembly to be sure it is clean and unclogged. If readings are still inconsistent, contact your nearest Allison distribution or dealer.
  8. Insert the fluid level indicator into fill the tube and remove. Check fluid level reading. Repeat the check procedure to verify the reading.
    9. IMPORTANT: Safe operating level is within the HOT RUN band on the fluid level indicator. The width of the HOT RUN band represents approximately 1.0 liter (1.06 quarts) of fluid at normal operating sump temperature.
  9. If the fluid level is not within the HOT RUN band, add or drain as necessary to bring the fluid level to within the HOT RUN band.
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