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The recommended interval for changing transmission fluid is usually every 30,000 miles. This task is slightly more difficult than an oil change or a radiator flush, but you can tackle it if you approach it step by step. You may want to check a service manual for your vehicle beforehand to see whether you need to know about any special procedures or precautions. Make sure to buy the right type of transmission fluid and replacement parts. Using a fluid that's not compatible with your vehicle could damage it.
Materials:
- Transmission filter and gasket
- Transmission fluid
- Gasket adhesive
- Extra-large catch basin
- Clean rags
- Wrenches
- Screwdrivers
- Safety glasses
- Cat litter for soaking up spills
Locate the transmission pan under the vehicle. We had to remove a section of the exhaust system and disconnect the oxygen sensor in order to access the pan of our demonstration vehicle (1999 Ford Explorer).
The transmission pan does not have a drain plug. The bottom of the pan must be partly removed in order to drain the fluid. Once it's drained, the pan can be disassembled completely so that a new transmission-fluid filter and gasket can be installed.
- Place an extra-large catch basin directly beneath the pan.
- Remove the bolts from three sides of the pan. The fourth side remains attached, forming a hinge that allows the pan bottom to tip down and drain the fluid.
- Tip the pan, allowing the fluid to drain into the catch basin. This part of the job is messy.
- Remove the rest of the bolts and remove the pan completely. Empty any remaining fluid into the catch basin.
- Remove the old gasket, and clean the upper surfaces of any fluid or residual rubber from the old gasket. You may want to use a parts washer to clean the pan thoroughly.
- Make sure the magnet strip remains inside the pan. The magnet picks up stray metallic particles that can end up in the transmission fluid through normal wear.
- Install the new gasket on the pan. To get a sure grip and make installation easier, place gasket adhesive around the holes in the rim of the pan before putting the gasket in place.
- Remove the old filter with a socket wrench or a nut-driver. Keep the old O-rings so they can be used on the new filter.
- Lubricate and install the O-rings on the new filter, and install the new filter.
- Reinstall the pan.
- Add new transmission fluid at the fill opening. Check your service manual or owner's manual to determine the type and quantity of fluid for your vehicle. Do not overfill.
- Take the vehicle for a drive and then, with the engine idling, check the transmission-fluid level with the dipstick. Check underneath the vehicle for leaks.
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