[mrein3]

A couple of things about transmission 'coolers'. I put coolers in quotes on purpose. Sometimes you want a warmer because you can have fluid that is too cold.

Up here in the north country where one may drive a truck in -30 fahrenheit air temps, having an external transmission cooler may cool the fluid down too well. So up here one should run the hot fluid from the transmission TO the external cooler then to the tank in the radiator. Down south where it is hot all the time you want the opposite. Run the hot line to the radiator then to the external cooler. I know a guy that fabbed up an "H" configuration with a bunch of valves to direct the hot tranny to the radiator first in the summer and to the external cooler first in the winter. But in my opinion that is overkill.

On eightbanger's truck - the one that came with external only - I would guess a previous owner wanted an auto but was too lazy or cheap to purchase the right radiator so he used the bailing wire approach and plumbed in an external cooler because it is easy.

shooterpcb - like Longhorn Man said, get something on there. You can do it right the first time and get an in-line tube kit and new radiator with the tank installed for the tranny fluid like in eightbanger's picture or use the bailing wire approach and just plumb in an external cooler. Pick one and do it fast.