GM Service Manual Online
For 1990-2009 cars only

Check the fluid with the engine off and the transmission in PARK.

  1. Clean away any dirt around the opaque plastic reservoir.
  2. Inspect the fluid level. The fluid level should be even with the fill marks on the side of the reservoir.
  3. If the fluid level is low, clean around and remove the reservoir cap.
  4. Add Dexron® III transmission fluid.
  5. Install the cap.