Car TipsHow To

How to Change Automatic Transmission Fluid

Changing automatic transmission fluid (ATF) is a crucial maintenance task that can extend the life of your vehicle’s transmission and ensure smooth gear shifting. Neglecting this essential task can lead to transmission problems and costly repairs down the road. In this comprehensive guide, we’ll walk you through the process of how to change automatic transmission fluid, so you can keep your car running smoothly.

Gather Your Tools and Materials

Before you begin, it’s essential to gather all the necessary tools and materials. Here’s what you’ll need:

  • A jack and jack stands
  • A socket set and ratchet
  • A wrench set
  • A funnel
  • A drain pan
  • Safety glasses and gloves
  • The appropriate amount and type of ATF (refer to your vehicle’s owner’s manual)
  • A new transmission fluid filter and gasket (if applicable)
  • A creeper or cardboard (optional but helpful for accessibility)

Prepare Your Vehicle

  1. Safety First: Ensure your vehicle is on a level surface and engage the parking brake. Wear safety glasses and gloves throughout the process.
  2. Access the Transmission: Depending on your vehicle, you may need to remove a plastic cover or access panel to reach the transmission.
  3. Locate the Drain Plug: Identify the transmission pan, which is typically made of metal and located beneath the transmission. Find the drain plug, usually a bolt or nut on the pan’s bottom.

Drain the Old Fluid

  1. Position the Drain Pan: Place the drain pan beneath the transmission pan to catch the old ATF.
  2. Loosen the Drain Plug: Using the appropriate socket or wrench, carefully loosen the drain plug. Be prepared for the fluid to flow out.
  3. Drain the ATF: Allow the old fluid to drain completely into the pan. This may take several minutes.
  4. Remove and Clean the Transmission Pan: After draining, remove the transmission pan, if necessary. Clean it thoroughly, including the magnet inside that traps metal debris.

Replace the Filter (if applicable)

  1. Locate the Filter: If your vehicle has a transmission fluid filter, remove it carefully. It’s often located under the transmission pan.
  2. Install the New Filter: Replace the old filter with a new one and secure it in place.

Reinstall the Transmission Pan

  1. Clean the Pan: Clean the transmission pan thoroughly to remove any remnants of the old gasket and ATF.
  2. Replace the Gasket: If your vehicle uses a gasket, install a new one. Some vehicles may use RTV silicone instead of a gasket.
  3. Reattach the Pan: Carefully reinstall the transmission pan and tighten the bolts evenly to avoid leaks.

Refill with New ATF

  1. Locate the Fill Port: Find the transmission’s fill port, often located near the engine bay.
  2. Use a Funnel: Insert a funnel into the fill port and carefully pour in the recommended amount of new ATF. Refer to your vehicle’s owner’s manual for the correct type and quantity.

Check ATF Level and Test Drive

  1. Start the Engine: Start your vehicle and allow it to idle for a few minutes.
  2. Check Fluid Level: With the engine running, check the ATF level using the dipstick (if your vehicle has one). Add more ATF if needed.
  3. Test Drive: Take your vehicle for a short test drive to ensure the transmission shifts smoothly.


Changing automatic transmission fluid is a vital maintenance task that can help keep your vehicle’s transmission running smoothly. By following this step-by-step guide and adhering to your vehicle’s specifications, you can complete this task safely and effectively, potentially saving yourself from costly repairs in the future. Regular ATF changes are a key part of keeping your vehicle in top condition.

Rachael McAdams

I'm Rachael, CEO of AutoGeeX, bring unrivaled expertise and passion to the automotive industry. With extensive knowledge and a deep understanding of cars, she shares captivating tales, invaluable insights, and practical tips with readers. As an active presence in the car community, Rachael ignites excitement, revolutionizing the automotive landscape with AutoGeeX's pursuit of perfection.

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