Where is an automatic transmission filter located?

Unlike an engine oil filter that is located on the outside of your engine, the transmission oil filter is found inside the transmission oil pan, underneath your vehicle. Replacement of the transmission filter is a significantly more involved process than an engine oil and filter change.

What can a clogged transmission filter cause?

If the transmission filter is allowed to become clogged, the flow of ATF will be restricted. Since the fluid is used to transfer hydraulic power for motion - and because it serves to lubricate and cool the transmission - any obstruction to its flow can be detrimental. Malfunctions, such as abnormal shifting, slipping, and overheating are likely. Premature wear and transmission failure are possible.

Should I change transmission fluid after 100k miles?

Often debated in the automotive community is the question as to whether it is wise to change the ATF in a transmission with high mileage, over 100K miles. One school of thought suggests that, if a transmission has seen more than 100K miles, the fluid has likely worn out, and sludge will have formed internally, making it necessary to change the fluid and filter. On the other hand, some automotive enthusiasts say that changing the ATF in a transmission with high mileage can cause damage if debris and sludge are dislodged and clog tiny passages in the unit. This argument relates particularly to transmissions that have seen sub-par maintenance up to that point. The best approach is to follow the manufacturer’s recommendations for transmission fluid and filter change intervals from the start.