[mysticmissle]

at minimum you are going to send a portion of preheated air thru your radiator with an independent trans cooler in front of it. you may see some efficiency from removing the current tranny fluid cooling capacity out of the radiator however, not sure how to quantify that. not sure how big that tru cool 40k is but you may be able to mount it off to one side where it does not obstruct the air going to the radiator. On my 64 i have a B&M plate style (12''x8''?) off to the passenger side and, and use the brake and have not had any trans failures, but to be fiar i have no idea what my trans temps are. I only know that the cooler off to the side has not effected the cars performance. I am going to be using that car on the street a lot more in its next renditon so only time will tell.
are you experiencing high temperatures now? a lot of users are puttin their coolers under the car or even toward the rear, and using the small fans to cool the fluid. might be something to consider if you have real estate.

[HWYSTR455]

I used a long/narrow stack plate and mounted it in the valance with some brackets I made using sheet steel.

It's still going to block some air flow, but it's not slammed right against the radiator.

You don't need to go too big with the stack plate coolers, they are much more efficient than tube & fin ones.

EDIT: I run thru the rad then the cooler, 4L80e, lockup set at 53mph, and it's kind of a loose converter. The cooler docs stated it's good for at least 30 degrees.

.

[Formulajones]

I have always used a basic stack plate style cooler mounted in front of the radiators. Usually something around 12" x10" or there about. The size depends on what I'm working on and the room I have where I want to mount it I typically make brackets and mount it behind the grill somewhere, not up against the radiator.

I've never had any adverse affects on engine cooling on any car.

I run them all the same way, through the engine radiator first and then through a trans cooler, back to the trans.

2 of the cars have 4l80's so I can easily monitor trans temps. From what I've seen they run about 20 degrees cooler than the engine does.