the oil filter micron thread got me thinking about transmission coolers. why, i don't have a clue, but anyway, here goes.

i have two coolers here, both 3/8" tube inlet/outlet size.
one is 12"x4"x1 1/2" thick, and is a "two pass" [just in, loop around, and out].
the other is 12"x11"x1 1/2" thick and is a six pass.
both are aluminum and use 3/4" tubes with aluminum fins in somewhat of the size of a radiator.

the question is, could the small one be used as a stand alone cooler for a 727/reverse manual 3800/4000 stall converter, heavy street/occasional strip car, or should i use the larger one ?
if i use the larger one, i have a [single] fan from a 90's minivan that fits perfectly, i could use if needed.
stand alone in a good airflow is the key, as the radiator to be used does not have an in tank cooler.

your opinions please, are greatly appreciated !
as always, TIA !