Anyone here have a Rodeo or Passport that have a transmission cooler installed? I'm not sure if my 1998 Honda Passport has a transmission cooler. If in fact the Passport have a transmission cooler, can I install a heavy duty aftermarket transmission cooler alongside the original one already installed in the Passport (given the Passport has one already installed)??

the stock one built in the radiator should be fine, unless you are planning on doing a lot of heavy towing.