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Instructions on how to replace all the
transmission fluid in the transmission and torque converter.
Make sure the fluid is warm. Warm up the car so the transmission is at normal operating
temperature. Pull the transmission dipstick (located near the firewall in most cars).
Fresh fluid is translucent and cherry red. Some darkening is normal, but if it is reddish
brown or mustard color and smells like burnt varnish, it is worn out.
Drain the fluid by loosening the pan. Select the correct Hastings filter replacement
based on pan shape and prepare a large pan to catch the fluid. Then loosen each pan bolt a
turn or two and loosen one corner more than rest. Drain mostly from this corner.
Finish removing the pan and any gasket material from the pan or case. Avoid scratching
the metal and make sure the pan’s gasket surface isn’t bent or distorted.
Remove the old filter. Most transmission filters are held in place with a bolt or two,
but some are held by a clip. Be careful to include O-Rings or other seals.
Install a new filter. Use the clips or bolts from the old filter. Be sure O-Rings, etc.
are in place. If the filter has a long intake neck, gently push the neck into place
without unseating the O-Ring.
Clean the pan thoroughly. Inspect the pan before cleaning. A small amount of fine grey
clutch dust is normal. However, if you find metal shavings, there has been transmission
damage. Clean the pan with solvent and wipe dry so there is no harmful residue.
Position gasket on pan. Some gaskets have four holes slightly smaller than the rest to
allow four bolts through the pan and through these smaller holes to hold the gasket in
place.
Hand tighten pan bolts in a criss-cross pattern. After that, use a torque wrench to
tighten bolts to proper ft-lbs as per manufacturer.
Refill the transmission using only the amount shown as “refill capacity” in
the owners manual or "AMSOIL Product Selection Guide,” using the type of fluid
specified for the vehicle.
If doing only a partial fluid replacement, skip to instruction 12 below. If doing a
complete fluid replacement, follow the steps in instruction.
You now have replaced the fluid in the pan. To replace the fluid in the torque
converter and oil cooler also, follow these steps.
Step 1. Obtain the total system capacity of the vehicle from the manufacturer or
AMSOIL. Have this amount readily available.
Step 2. Disconnect the oil cooler line from the oil cooler. As you may not know
which is the pressure side and which is the return side, have both directed so the stream
of fluid will be directed toward a receptacle.
Step 3. With another person, be prepared to add ATF to the fill area as it is
being pumped out of the oil cooler line.
Step 4. Start the engine, and as the old fluid is pumped out, add fresh fluid to
the pan.
Step 5. When either the fluid color brightens or the total capacity has been
replaced, shut the engine off and re-attach the oil cooler line. All fluids has now been
changed.
