How to Change Your Automatic Transmission Fluid

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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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Torrieanto

11 years of experience
525 reviews
Torrieanto
11 years of experience
Volkswagen Jetta - Transmission Fluid Service - Saint Petersburg, Florida
Torrieanto was very polite and efficient. My fiance was home while Mr. Torrieanto was working on the car. He was very nice and did a great job. I'm so glad to have my car back working. I appreciate everything Mr. Torrieanto did for me. I will definitely be booking him for ANY and ALL further work to be completed on my car. He was very skilled with my Jetta. I'm glad I found this website and Mr. Torrieanto. I will suggest him to ANYONE and EVERYONE looking for work done on their car!
Buick Verano - Transmission Fluid Service - Largo, Florida
Excellent! Torrieanto is very personable and EXTREMELY knowledgeable! I thought I knew something about cars, but not like this guy! His work is very clean and efficient, and I will definitely ask for him when I next need work done.

Stephen

31 years of experience
29 reviews
Stephen
31 years of experience
Chevrolet Impala - Transmission Fluid Service - Broomfield, Colorado
Stephen arrived early for my appointment. He is very knowledgeable, professional, and personable. He went right to work on my car that was needing a transmission fluid change and was very thorough and careful about the process. He did an excellent job, cleaned up after he was finished. There wasn't one drop of transmission fluid on my garage floor when he was finished with the job. Stephen gave me a report about the inspection of my car and of what he found out about the health of the transmission. I will most certainly have Stephen back again when my vehicle needs to have a repair in the future. Great job!
Acura TL - Transmission Fluid Service - Denver, Colorado
Midas tried to say I needed the idle air control valve replaced after they put in my catalytic converter, although you just replaced it. Either way hopefully it will pass emissions.

Xavier

10 years of experience
23 reviews
Xavier
10 years of experience
Toyota Tundra - Transmission Fluid Service - Frisco, Texas
Xavier showed up on time, completed the work, and even noticed a small crack in a part and went to the store to get a replacement so it wouldn't cause trouble in the future.

Nicholas

10 years of experience
304 reviews
Nicholas
10 years of experience
Acura TL - Transmission Fluid Service - Raleigh, North Carolina
Excellent! He was very straightforward and very helpful. I’m really glad that I had him take a look at it. The car drove a bit better but I hope it lasts.

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