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Re: transmssion cooler theory question
Good questions.
Go with the biggest cooler (most rows) you can, especially since you do not have an in-rad cooler. Smaller coolers only exist to sell at a cheaper price and/or to fit in tight spaces.
Pressure drop due to a longer line does not seem to matter. When I installed an Olds 455 in my '81 Cadillac, I eliminated the air conditioning. However, I left the AC condensor in place (in front of the rad.) I hooked the trans cooler lines up to it, just because it was easier to do than installing a real trans cooler. It has enough tubing to make about 10 transmission coolers, keeps the fluid super cool and has not caused a problem.
The cooler will not block rad airflow enough to make any difference. The factory AC condensor blocks airflow much more than a cooler would, but is just fine in practice. Air does not need to whip through the rad at 60 mph to provide sufficient cooling, Just a few MPH of airflow is enough for a car which is not pulling a trailer.
Most coolers are placed directly on the rad to take advantage of fan airflow and to make installation quick and easy. I have installed coolers both a few inches away from the rad and directly on the rad. IMO so long as the cooler is getting decent airflow, I do not think it matters much, but I prefer mounting away from the rad for max airflow when driving.
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