How to Change the Transmission Oil on a Duramax


The Chevy Silverado is also known by its nickname Duramax. It refers to the name of the diesel engine that the truck is fitted with from the factory. This engine produces a lot of low-end torque, which is ideal for towing and hauling. Heavy-duty use puts strain on the transmission, however, so regular maintenance is a must.

Things You'll Need

  • 7.4 quarts of new transmission oil
  • Socket wrench with socket set
  • Oil catch pan
  • Shop rags
  • Funnel
  • Place the oil pan under the transmission.

  • Crawl under the truck and locate the drain bolt on the bottom of the transmission. Turn the bolt counterclockwise with a socket wrench to remove it.

  • Let the transmission oil drain into the oil pan.

  • Replace the drain bolt and tighten it.

  • Open the hood and pull the transmission dipstick out of the transmission filler tube. Place a funnel into the filler opening and pour in the new transmission fluid. The transmission should hold 7.4 quarts of fluid since you are not completely flushing the system.

  • Wipe off the dipstick and put it back into the filler tube. Pull the dipstick back out and examine it. The fluid level should be between the upper and lower marks on the tip of the dipstick.

Tips & Warnings

  • Change the transmission oil every 30,000 miles or every 15,000 miles if you are towing every day. The old fluid can be recycled by any auto parts store.


  • Chevrolet Silverado, GMC Sierra 2WD and 4WD Repair Manual 1999-2006; Jeff Kibler, John H. Haynes; 2007
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