Transmission fluid change instructions needed

  • 1999 LINCOLN LS
  • 3.9L
  • V8
  • 2WD
  • 146,000 MILES
How do I change the transmission fluid on the car listed above and what tools will I need?
Do you
have the same problem?
Thursday, October 17th, 2019 AT 9:34 PM

1 Reply

Welcome to 2CarPros. Draining the fluid is easy. You need to get the vehicle level and high enough to safety get under it. Now start the engine and run the transmission through each gear pausing in each gear for about 20 seconds. The idea is to warm up the fluid and release much of it back into the pan. Ideally you want the transmission fluid at approximately 80-110 degrees. Then look in the images below you will see the drain plug set-up on the transmission. If you look at the last image you will see the way the plug is made. There is a small plug in the middle of a larger plug. The larger plug is the main drain plug. Removing it will allow you to drain the fluid.
Now is the hard part. Filling the transmission. For this you need the special adapter shown in the third image as well as an air compressor and the special filler tool as well as a small vacuum pump.
To fill the transmission you install the fill adapter into the central small plug and then you attach the filler tool with it full of Mercon V. Now you apply 30 psi air to the filler tool to force the fluid into the transmission. You add fluid until you see that fluid is draining back into the filler. Once you see that you use the vacuum pump to the fillers lid. You apply vacuum to draw off any excess fluid.
To verify the level of the fluid, you should see a few drops come out of the fill adapter. If the vehicle is level and you get a few drops of fluid the transmission out of the adapter the transmission is now full. Remove the adapter and put the small plug back in. Start the engine, run the transmission through the gears again. Now go back to the adapter and remove the small plug and see if and fluid comes out. If you get a small amount, place the plug back in. If you don't you need to reinstall the adapter and the fill tool and add fluid until it drains back again like you did the first time.
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Thursday, October 17th, 2019 AT 11:30 PM

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