Magnefine inline transmission filter
 

I just installed my performabuilt level 2, 4l60e and decided to install one of these inline filters. It goes in the return line from the trans cooler. I like the idea of trapping any metal particles via the magnet and it also traps super fine particles that the stock filter can't. The filter also has a built in bypass in case the filter becomes clogged.
https://www.ebay.com/itm/New-Magnefi....c100005.m1851

This looks like the same filter but sold under the Raybestos label. Much cheaper.
https://www.ebay.com/itm/Raybestos-5....c100752.m1982