How to Clean a Transmission Filter

1. Disassemble the filter, noting how it is put together so you can reassemble it in the correct order. Use a bench grinder to cut the crimps that hold the clamshell-like transmission filter together. Hold the bench grinder perpendicular to the filter and run it along its perimeter to separate the seam.
2. Drill through the mounting hole crimps with a drill bit to separate the two halves.
3. Hold the filter pieces over a pan and spray them with disc brake cleaner to clean them. The dirt and particles will drip off into the pan. Anything that is still stuck to the filter pieces can be dislodged with a toothbrush. Be careful not to damage the brass parts with the toothbrush.
4. File the rough outer edges of the filter pieces.
5. Reassemble the pieces together in the correct order and put new crimping metal in place with crimpers.