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How to Change the Transmission Fluid in a Torqshift Transmission

Anyone can learn to do their own basic car repairs!

Anyone can learn to do their own basic car repairs!

Do You Have a Ford Super Duty Truck?

If you have a Ford Super Duty truck, at some point, you have probably thought, "How do I change the transmission fluid on my 5R110W or 6R140 transmission? If this sounds like you, keep reading, there's a lot more information ahead.

The 5R110W and 6R140 transmissions were mostly used on Ford F250 and F350 trucks. Changing your own transmission fluid can save you money on vehicle repairs and keep your truck in better condition. Ford recommends you change your transmission fluid every 30,000 miles in order to keep your truck in the best condition possible. If you skip fluid changes, you could risk significantly lowering the life expectancy of your transmission.

Besides, who doesn’t want to know how to be a little handier when it comes to routine maintenance?

You'll need some basic tools

You'll need some basic tools

Get Your Tools Ready

Here’s what you’re going to need to change your 5R110W or 6R140 Torqshift transmission.

  • Automatic transmission fluid drain container
  • 13mm, 10mm, and 22mm socket wrenches
  • A swivel joint and extenders for your wrench
  • A screwdriver, any type
  • New filters
  • Fresh ATF

Once you’ve got your mechanic's mise en place together, you can start work on your truck.

It's time to remove the transmission pan plug

It's time to remove the transmission pan plug

Removing the Transmission Pan Plug

Transmission fluid is messy stuff. The first thing to do is make sure your fluid drain container is directly underneath your transmission pan. This will let you catch all the old fluid and help you to properly dispose of it later.

Use your 13 mm socket wrench to remove the transmission pan plug. Fluid will start to drain out when the plug gets loose, so make sure to do this as fast as you can. Wearing neoprene or latex gloves can help you with the cleaning later.

After the fluid is drained, replace the plug.

Removing the Transmission Fluid Pan

The pan is secured with 20 bolts. They are all the same and require your 10mm socket wrench to unscrew.

Remove the first 18 of the bolts leaving the ones on the passenger and driver side fixed in place. You’ll need the swivel joint and extenders to get at these bolts.

As you unscrew the last two bolts, keep your free hand firmly pressed against the fluid pan. It will still have some ATF in it even after being drained.

Lower it down slowly and drain the remaining fluid into the disposal container.

It's time to remove the filter assembly

It's time to remove the filter assembly

Remove the Filter Assembly

You should be able to freely remove the large pan filter assembly by rocking it slowly from side to side. It should come loose easily without much effort on your part.

Install Your New Filter

First check to see that the filter gasket, or o-ring, was removed with the old filter. They tend to stick in the filter orifice. If it is stuck, simply use your screwdriver to gently pry it free.

Use some old ATF to lubricate the new filter gasket and install the new filter in a reverse manner from which you removed the old one.

Clean and Reinstall the Transmission Pan

You’re going to want to take this opportunity to inspect and clean the magnet just above the plug in the transmission pan. If you notice any metallic debris on the magnet, it’s a sign that your transmission is damaged and needs professional repair. The larger the debris, the more serious the damage.

Clean and reinstall the transmission pan. The bolts should be torqued to 11 foot-pounds each.

Swapping Out the External Transmission Filter

This secondary filter is located on the passenger side. Remove it using the 22mm socket wrench and discord the old housing and gasket.

Discard the old filter, but retain the spring and magnetic base. Remember to properly dispose of all used oils and oil filters. Your local mechanics or parts shop can help you with the disposal.

Gently clean the magnet and springs. The magnet’s housing is plastic and harsh cleaners can damage the casing.

Apply some ATF to the new gasket and install your new filter on the magnet’s housing. Reinstall the new filter assembly by reversing the steps you took to remove the old one.

Let's wrap this up!

Let's wrap this up!

Finishing Up

Open the hood of your truck and locate your transmission dipstick. Remove the dipstick and add new ATF until it reaches the cold fill line. You can take out the guesswork by measuring the amount of fluid you removed.

Run your engine for 2 to 3 minutes and check for leaks. You can make this easier by sliding a clean piece of cardboard under your vehicle which makes any drips easier to spot.

Drive your vehicle and allow it to reach full operating temperature and, once again, inspect for any leaks. If your ATF has not been routinely serviced, you may need to drain and refill again by only performing the first step of this guide.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

© 2021 Luke Wilhoit