How to Change Your Automatic Transmission Fluid

Besides the engine, the transmission is the most expensive part of your vehicle. And like engine oil, the transmission fluid requires periodic replacement. Many automatic transmissions also have an internal filter that needs to be replaced along with the fluid.

The transmission fluid has several responsibilities:

  • Transfer hydraulic pressure and force to the internal transmission components
  • Help reduce friction
  • Transfer excess heat away from high temperature components
  • Lubricate internal transmission components

The main threat to automatic transmission fluid is heat. Even if the transmission is kept at the proper operating temperature, the normal operation of the internal parts still create heat. This breaks down the fluid over time and can cause gum and varnish. This can lead to sticking valves, increased fluid breakdown, contamination and transmission damage.

Because of this, it’s important to change your transmission fluid according to the time interval listed in your owner’s manual. This is generally every 2 to 3 years or 24,000 to 36,000 miles. If the vehicle sees frequent severe use, such as towing, the fluid should be changed once a year or every 15,000 miles.

The following steps will show you how to replace the transmission fluid on a conventional transmission with a dipstick.

  • Note: Many new vehicles do not have dipsticks. They may also have complicated service procedures or be sealed and completely unserviceable.

Step 1 of 4: Prepare the vehicle

In order to safely and efficiently service your transmission, you need few items in addition to basic hand tools.

Materials Needed

Part 1 of 4: Prepare the vehicle

chocking the rear wheels

Step 1: Chock the wheels and set the emergency brake. Park your vehicle on level ground and set the emergency brake. Then place wheel chocks behind the front wheels.

jacking up vehicle

Step 2: Jack up the vehicle. Place the jack under a sturdy portion of the frame. After you have the vehicle in the air, place jack stands under the frame and lower the jack.

If you have any questions as to where to place the jack on your particular vehicle, consult the repair manual.

pan under the vehicle

Step 3: Place a drain pan under the vehicle.

Part 2 of 4: Drain the transmission fluid

loosening the drain plug

Step 1: Remove the drain plug (if equipped). Some transmission pans have a drain plug mounted in the pan. Loosen the plug using a ratchet or wrench. Then, remove it and allow the fluid to pour into the oil drain pan.

Part 3 of 4: Replace the transmission filter (if equipped)

Some vehicles, mostly domestics, have a transmission filter. To access this filter and drain the transmission fluid, the transmission pan must removed.

loosening transmission pan bolts

Step 1: Loosen the transmission pan bolts. To remove the pan, remove all the front and side retaining bolts. Then, loosen the rear retaining bolts a few turns and pry or tap the pan loose.

Allow all of the fluid to drain out.

removing the pan

Step 2: Remove the transmission pan. Remove the two rear pan bolts, pull the pan down and remove its gasket.

removing the filter

Step 3: Remove the transmission filter. Remove all of the filter retaining bolts (if equipped). Then pull the transmission filter straight down.

locating the transmission screen seal

Step 4: Remove the transmission pickup screen seal (if equipped). Remove the transmission pickup screen seal inside the valve body with a pick of small screwdriver.

Be careful not to nick the valve body in the process.

installing the pickup screen seal

Step 5: Install the new pickup screen seal. Install the new pickup tube seal on the transmission filter pickup pipe.

installing the transmission filter

Step 6: Install the new transmission filter. Insert the pickup tube into the valve body and push the filter up towards it.

The re-install the filter retaining bolts until they are snug.

cleaning the transmission pan

Step 7: Clean the transmission pan. Remove the old filter from the transmission pan. Then, clean the pan using brake clean and a lint-free rag.

installing the pan

Step 8: Reinstall the transmission pan. Position the new gasket on the pan. Install the pan and secure it with the retaining bolts.

Tighten the retainers until they are snug. Do not over-tighten the bolts or you will distort the transmission pan.

If you have any doubts, consult the vehicle repair manual for the exact torque specifications.

Part 4 of 4: Put in the new transmission fluid

installing the drain plug

Step 1: Reinstall the transmission drain plug (if equipped). Reinstall the transmission drain plug and tighten it until it’s snug.

Step 2: Remove the jack stands. Jack up the vehicle in the same location as before. Remove the jack stands and lower the vehicle.

removing the transmission dipstick

Step 3: Locate and remove the transmission dipstick. Locate the transmission dipstick.

Generally, it will be on the side of the engine near the back and it will have a yellow or red handle.

Remove the dipstick and set it aside.

pouring transmission fluid into the dipstick

Step 4: Pour the transmission fluid in. Using a small funnel, pour the transmission fluid into the dipstick.

Consult the vehicle repair manual for the correct type and amount of fluid to add. Most auto parts stores will also be able to provide this information.

Reinsert the dipstick.

Step 5: Allow the engine to reach operating temperature. Start the vehicle and allow it idle until it reaches operating temperature.

checking the transmission fluid

Step 6: Check the transmission fluid level. With the engine still running, move the gear selector through each position while holding your foot on the brake. With the engine still running, put the vehicle back in park and pull out the transmission dipstick. Wipe it off and reinsert it. Pull it back out and check that the fluid level is between the hot full and add marks.

Add fluid as necessary but do not overfill the transmission or damage may occur.

  • Note: In most cases, transmission fluid level must be checked with the engine running. Consult your owner’s manual for the correct procedure for your vehicle.

Step 7: Remove the wheels chocks.

Step 8: Drive the vehicle and recheck the fluid level. Drive the vehicle a couple miles or so, then recheck the fluid level, adding as needed.

Performing a transmission service can be a dirty and difficult job. If you prefer to have the job done for you, give the experts at YourMechanic a call.


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Theodore

17 years of experience
1794 reviews
Theodore
17 years of experience
Ford Fusion L4-1.6L Turbo - Transmission Fluid Service - Lynnwood, Washington
Once again. Theodore, fast, efficient, and effective. A professional mechanic with vast experience. I would recommend 10/10.
Mitsubishi Lancer - Transmission Fluid Service - Bellevue, Washington
He is quick, efficient! Reached well before appointment time. Completed my service for old change, transmission fluid change, brake fluid flush, tire rotation in 2 hours! Didn't talk alot, or oversell more services. I would highly recommend Theodore!

Greg

23 years of experience
624 reviews
Greg
23 years of experience
GMC Terrain V6-3.0L - Transmission Fluid Service - Mesa, Arizona
Great mechanic. Greg does good work and he explained everything in terms that I understood. Would definately recommend!
Mercedes-Benz C250 - Transmission Fluid Service - Laveen, Arizona
Omg I would give him a  if I wa able to! He is so thorough honest and very professional! I am so glad I chose you all to maintain my car. I have referred 3 of my friends! Greg is my Guy I will like to have each anytime I need repairs!! Thank You Greg for EVERYTHING!! I really appreciate all you done! And then some! Stay Safe!

Andrew

16 years of experience
657 reviews
Andrew
16 years of experience
Ford Mustang V6-3.8L - Transmission Fluid Service - Portland, Oregon
Andrew was on time, polite, knowledgeable and I had avery good experience all in all. He did beautiful work and I would definitely recommend him to friends and family.

Michael

22 years of experience
391 reviews
Michael
22 years of experience
Toyota RAV4 L4-2.5L - Transmission Fluid Service - Montclair, California
It was a pleasure having Mike work on my car. He went above and beyond to make sure I was completely satisfied. I would not hesitate to hire Mike to work on your car. He’s honest, knowledgeable, reliable, and very friendly. He’s everything you would want your mechanic to be. I highly recommend Mike. Thanks!

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