A904 Cooler Line

That canister is the trans filter, which was used up thru 1963. There was just a screen inside the trans. Those filters are hard to find, and expensive when found. What can be done, is to remove the inline filter, and replace it with a section of line. Then install the 64-65 filter in the trans. This filter has two large holes for fluid. Do not use a filter for the later transmissions that have only one hole. Also use a 64 up trans pan. It has a depression (the 63 and older pans were flat on the bottom) to allow room for the internal filter.